Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income, Net of Related Tax Effects) (Details)

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Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income, Net of Related Tax Effects) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period $ (4,063) $ (8,887) $ (22,617)
Other comprehensive income (loss) before reclassifications 8,789 5,209 15,660
Amounts reclassified from other comprehensive income (9,052) 130 (1,930)
Net other comprehensive income (loss) during the period (263) 5,339 13,730
Purchase of non-controlling interest (16,555)    
Accumulated other comprehensive income at end of period (4,425) (4,063) (8,887)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   14,085  
Unrealized Holding Gains (Losses) on Available-For-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period (60) (4) (4)
Other comprehensive income (loss) before reclassifications 56 (56) 0
Amounts reclassified from other comprehensive income 0 0 0
Net other comprehensive income (loss) during the period 56 (56) 0
Accumulated other comprehensive income at end of period (4) (60) (4)
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period 11,964 (10,716) 6,773
Other comprehensive income (loss) before reclassifications 6,669 23,065 (15,559)
Amounts reclassified from other comprehensive income (9,052) 130 (1,930)
Net other comprehensive income (loss) during the period (2,383) 23,195 (17,489)
Purchase of non-controlling interest (99)    
Accumulated other comprehensive income at end of period 9,482 11,964 (10,716)
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period (15,967) 1,833 (29,386)
Other comprehensive income (loss) before reclassifications 2,064 (17,800) 31,219
Amounts reclassified from other comprehensive income 0 0 0
Net other comprehensive income (loss) during the period 2,064 (17,800) 31,219
Accumulated other comprehensive income at end of period (13,903) (15,967) $ 1,833
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Purchase of non-controlling interest $ (99)    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (515)  
Accounting Standards Update 2017-12 [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (515)  
Accounting Standards Update 2017-12 [Member] | Unrealized Holding Gains (Losses) on Available-For-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   0  
Accounting Standards Update 2017-12 [Member] | Unrealized Holding Gains (Losses) on Derivative Transactions [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (515)  
Accounting Standards Update 2017-12 [Member] | Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 0