Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of total income tax expense and applying the federal income tax rate to income before provision (benefit) for income taxes:
Computed "expected" tax provision	$ 56,723	$ 78,181	$ 55,955
Provision (benefit) for income taxes:
Federal-current	13,083	118,314	92,237
Federal-deferred	(9,579)	(214,132)	(64,441)
State-current	522	28,034	10,152
State-deferred	158	(47,814)	(8,056)
Foreign-current	31,581	27,167	59,170
Foreign-deferred	1,948	(8,844)	(26,935)
Changes in income taxes resulting from:
Tax adjustment relating to REIT	(51,625)	(63,333)	0
Deferred tax adjustment and other taxes due to REIT conversion	(9,067)	(182,853)	0
State taxes (net of federal tax benefit)	2,017	2,207	4,384
Increase in valuation allowance (net operating losses)	33,509	9,404	2,832
Decrease in valuation allowance (foreign tax credits)	0	0	(30,018)
Foreign repatriation	4,030	46,356	44,751
Foreign restructuring	0	0	17,691
Impairment of assets and other transaction costs	0	2,869	6,576
Reserve accrual (reversal) and audit settlements (net of federal tax benefit)	(2,874)	3,175	(16,322)
Foreign tax rate differential	(8,915)	(9,496)	(33,852)
Disallowed foreign interest, Subpart F income, and other foreign taxes	18,022	12,502	9,708
Other, net	(4,107)	3,713	422
Provision (Benefit) for Income Taxes	$ 37,713	$ (97,275)	$ 62,127