Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Accumulated Other Comprehensive Income (Accumulated Other Comprehensive Income, Net of Related Tax Effects) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period $ (20,836) $ 15,833 $ 35,360
Other comprehensive income (loss) before reclassifications (2,047) (23,970) (17,816)
Amounts reclassified from other comprehensive income 266 (12,699) (1,711)
Net other comprehensive income (loss) during the period (1,781) (36,669) (19,527)
Accumulated other comprehensive income at end of period (22,617) (20,836) 15,833
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 (2) 4 (6)
Other comprehensive income (loss) before reclassifications (2) (6) 10
Amounts reclassified from other comprehensive income 0 0 0
Net other comprehensive income (loss) during the period (2) (6) 10
Accumulated other comprehensive income at end of period (4) (2) 4
Unrealized Holding Gains (Losses) on Derivative Transactions [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period 6,087 8,995 1,244
Other comprehensive income (loss) before reclassifications 420 9,791 9,462
Amounts reclassified from other comprehensive income 266 (12,699) (1,711)
Net other comprehensive income (loss) during the period 686 (2,908) 7,751
Accumulated other comprehensive income at end of period 6,773 6,087 8,995
Foreign Currency Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income at beginning of period (26,921) 6,834 34,122
Other comprehensive income (loss) before reclassifications (2,465) (33,755) (27,288)
Amounts reclassified from other comprehensive income 0 0 0
Net other comprehensive income (loss) during the period (2,465) (33,755) (27,288)
Accumulated other comprehensive income at end of period $ (29,386) $ (26,921) $ 6,834