Accumulated Other Comprehensive (Loss) Income Components and Activity in Accumulated Other Comprehensive (Loss) Income Net of Deferred Income Taxes (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance				$ 3,401,313	$ 1,488,635
Other comprehensive (loss) income, before reclassifications		$ (44,586)	$ 45,297	44,796	(255,228)
Amounts reclassified from accumulated other comprehensive (loss) income		945	528	1,471	1,084
Total other comprehensive (loss) income, net of tax		(43,641)	45,825	46,267	(254,144)
Other comprehensive loss attributable to noncontrolling interests		(152)	51	(435)	151
Ending Balance		3,306,346	3,315,890	3,306,346	3,315,890
Accumulated Foreign Currency Adjustment Attributable to Parent
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(365,291)	(407,279)	(463,914)	(52,835)
Ending Balance		(416,636)	(351,001)	(416,636)	(351,001)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive (loss) income, before reclassifications		(51,193)	56,227	47,713	(298,344)
Amounts reclassified from accumulated other comprehensive (loss) income		0	0	0	27
Total other comprehensive (loss) income, net of tax		(51,193)	56,227	47,713	(298,317)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive loss attributable to noncontrolling interests		(152)	51	(435)	151
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(757)	2	(758)	0
Ending Balance		(338)	4	(338)	4
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive (loss) income, before reclassifications		0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	419	2	420	4
Total other comprehensive (loss) income, net of tax		419	2	420	4
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive loss attributable to noncontrolling interests		0	0	0	0
Accumulated Net Investment Gain (Loss)
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		52,721	65,430	62,245	11,384
Other comprehensive (loss) income, before reclassifications		6,607	(10,930)	(2,917)	43,116
Amounts reclassified from accumulated other comprehensive (loss) income		0	0	0	0
Total other comprehensive (loss) income, net of tax		6,607	(10,930)	(2,917)	43,116
Other comprehensive loss attributable to noncontrolling interests		0	0	0	0
Ending Balance		59,328	54,500	59,328	54,500
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(18,336)	(20,435)	(18,861)	(20,962)
Ending Balance		(17,810)	(19,909)	(17,810)	(19,909)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(331,663)	(362,282)	(421,288)	(62,413)
Total other comprehensive (loss) income, net of tax				45,832	(253,993)
Ending Balance		(375,456)	(316,406)	(375,456)	(316,406)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive (loss) income, before reclassifications		0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income	[2]	526	526	1,051	1,053
Total other comprehensive (loss) income, net of tax		526	526	1,051	1,053
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive loss attributable to noncontrolling interests		$ 0	$ 0	$ 0	$ 0

[1] The pre-tax portion of amounts reclassified from accumulated other comprehensive (loss) income consists of amortization of prior service benefit, which is a component of pension and postretirement benefits cost (credit). See Note 13, “Pension Plans and Other Postretirement Benefits.”

[2] The pre-tax portion of amounts reclassified from accumulated other comprehensive (loss) income is included in interest expense.