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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, 2018
Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, at beginning of period $ 1,257,455  
Other comprehensive (loss) income before reclassifications 36,382 $ 40,271
Amounts reclassified from accumulated other comprehensive income (loss) 6,255 (1,074)
Net (decrease) increase in other comprehensive income 42,637 39,197
Accumulated Other Comprehensive Income (Loss), Net of Tax, at end of period 982,466 2,215,941
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, at beginning of period (781,786) (943,029)
Accumulated Other Comprehensive Income (Loss), Net of Tax, at end of period (739,149) (903,832)
Derivative Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, at beginning of period (21,098) 17,469
Other comprehensive (loss) income before reclassifications (5,319) (12,584)
Amounts reclassified from accumulated other comprehensive income (loss) 4,431 (2,229)
Net (decrease) increase in other comprehensive income (888) (14,813)
Accumulated Other Comprehensive Income (Loss), Net of Tax, at end of period (21,986) 2,656
Available-for-Sale Security    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, at beginning of period (2,799) 3,149
Other comprehensive (loss) income before reclassifications (80) (1,314)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net (decrease) increase in other comprehensive income (80) (1,314)
Accumulated Other Comprehensive Income (Loss), Net of Tax, at end of period (2,879) 1,835
Defined Benefit Pension Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, at beginning of period (143,213) (157,704)
Other comprehensive (loss) income before reclassifications (208) (100)
Amounts reclassified from accumulated other comprehensive income (loss) 1,824 1,155
Net (decrease) increase in other comprehensive income 1,616 1,055
Accumulated Other Comprehensive Income (Loss), Net of Tax, at end of period (141,597) (156,649)
Currency Translation Adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, at beginning of period (614,676) (805,943)
Other comprehensive (loss) income before reclassifications 41,989 54,269
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net (decrease) increase in other comprehensive income 41,989 54,269
Accumulated Other Comprehensive Income (Loss), Net of Tax, at end of period $ (572,687) $ (751,674)