Changes in Cumulative Other Comprehensive Loss (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015
Changes in Net Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance		$ 867,910
Ending balance		1,597,783		$ 976,165
Tax expense (benefit) for unrealized net gains (losses) on available-for-sale securities before reclassifications		(509)		966
Tax benefit for unrealized net losses on cash flow hedges		60,093
Tax expense (benefit) related to pension and other postretirement benefit plans		10		(593)
Tax benefit for realized losses on the sale of available-for-sale securities for amounts reclassified from other comprehensive loss		(61)		(303)
Foreign Currency Translation Adjustments [Member]
Changes in Net Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance		(482,629)		(354,384)
Amounts recognized in other comprehensive loss		24,702	[1]	(98,120)	[2]
Amounts reclassified from other comprehensive loss	[3]
Net change		24,702		(98,120)
Ending balance		(457,927)		(452,504)
Pension and Other Postretirement Benefit Adjustments [Member]
Changes in Net Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance		(104,346)		(118,167)
Amounts reclassified from other comprehensive loss		474	[3]	1,734	[4]
Net change		474		1,734
Ending balance		(103,872)		(116,433)
Unrealized Net (Losses) Gains on Available-for-Sale Securities [Member]
Changes in Net Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance		(120)		593
Amounts recognized in other comprehensive loss		822	[1]	(1,557)	[2]
Amounts reclassified from other comprehensive loss		99	[3]	484	[4]
Net change		921		(1,073)
Ending balance		801		(480)
Unrealized Net Losses on Cash Flow Hedges [Member]
Changes in Net Other Comprehensive (Loss) Income [Roll Forward]
Amounts recognized in other comprehensive loss	[1]	(97,223)
Net change		(97,223)
Ending balance		(97,223)
Total Cumulative Other Comprehensive (Loss) Income [Member]
Changes in Net Other Comprehensive (Loss) Income [Roll Forward]
Beginning balance		(587,095)		(471,958)
Amounts recognized in other comprehensive loss		(71,699)	[1]	(99,677)	[2]
Amounts reclassified from other comprehensive loss		573	[3]	2,218	[4]
Net change		(71,126)		(97,459)
Ending balance		$ (658,221)		$ (569,417)

[1] Net of taxes of $(509) for unrealized net gains on available-for-sale securities and $60,093 for unrealized net losses on cash flow hedges.

[2] Net of taxes of $966 for unrealized net losses on available-for-sale securities.

[3] Net of taxes of $10 for pension and other postretirement benefit adjustments and $(61) for realized losses on the sale of available-for-sale securities.

[4] Net of taxes of $(593) for pension and other postretirement benefit adjustments and $(303) for realized losses on the sale of available-for-sale securities.