Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Details)

v3.8.0.1
Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss) at beginning of period $ (8,887) $ (22,617)
Other comprehensive income (loss) before reclassifications 441 9,814
Amounts reclassified from other comprehensive income 12 (89)
Net other comprehensive income (loss) during the period 453 9,725
Accumulated other comprehensive income (loss) at end of period (8,949) (12,892)
Unrealized Gains (Losses) on Available-For-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss) at beginning of period (4) (4)
Other comprehensive income (loss) before reclassifications 4 4
Amounts reclassified from other comprehensive income 0 0
Net other comprehensive income (loss) during the period 4 4
Accumulated other comprehensive income (loss) at end of period 0 0
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss) at beginning of period (10,716) 6,773
Other comprehensive income (loss) before reclassifications (4,582) (1,438)
Amounts reclassified from other comprehensive income 12 (89)
Net other comprehensive income (loss) during the period (4,570) (1,527)
Accumulated other comprehensive income (loss) at end of period (15,801) 5,246
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss) at beginning of period 1,833 (29,386)
Other comprehensive income (loss) before reclassifications 5,019 11,248
Amounts reclassified from other comprehensive income 0 0
Net other comprehensive income (loss) during the period 5,019 11,248
Accumulated other comprehensive income (loss) at end of period 6,852 $ (18,138)
Accounting Standards Update 2017-12 [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications (515)  
Accounting Standards Update 2017-12 [Member] | Unrealized Gains (Losses) on Available-For-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications 0  
Accounting Standards Update 2017-12 [Member] | Unrealized Holding Gains (Losses) on Derivative Transactions [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications (515)  
Accounting Standards Update 2017-12 [Member] | Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications $ 0