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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Balances for Each Component of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 669,465 $ 1,257,455
Other comprehensive income (loss) before reclassifications 20,622 36,382
Amounts reclassified from accumulated other comprehensive income (loss) 670 6,255
Net increase in other comprehensive income (loss) 21,292 42,637
Ending balance 518,517 982,466
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (859,226) (781,786)
Net increase in other comprehensive income (loss) 21,292 42,637
Ending balance (837,934) (739,149)
Derivative Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 11,411 (21,098)
Other comprehensive income (loss) before reclassifications 5,818 (5,319)
Amounts reclassified from accumulated other comprehensive income (loss) (759) 4,431
Net increase in other comprehensive income (loss) 5,059 (888)
Ending balance 16,470 (21,986)
Available-for-Sale Security    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (6,547) (2,799)
Other comprehensive income (loss) before reclassifications 1,877 (80)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net increase in other comprehensive income (loss) 1,877 (80)
Ending balance (4,670) (2,879)
Defined Benefit Pension Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (142,763) (143,213)
Other comprehensive income (loss) before reclassifications (1,206) (208)
Amounts reclassified from accumulated other comprehensive income (loss) 1,429 1,824
Net increase in other comprehensive income (loss) 223 1,616
Ending balance (142,540) (141,597)
Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (721,327) (614,676)
Other comprehensive income (loss) before reclassifications 14,133 41,989
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net increase in other comprehensive income (loss) 14,133 41,989
Ending balance $ (707,194) $ (572,687)