Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	$ 51,325	$ 56,723	$ 78,181
Provision (benefit) for income taxes:
Federal-current	52,944	13,083	118,314
Federal-deferred	(28,127)	(9,579)	(214,132)
State-current	6,096	522	28,034
State-deferred	(1,479)	158	(47,814)
Foreign-current	36,272	31,581	27,167
Foreign-deferred	(20,762)	1,948	(8,844)
Changes in income taxes resulting from:
Tax adjustment relating to REIT	(18,526)	(51,625)	(63,333)
Deferred tax adjustment and other taxes due to REIT conversion	247	(9,067)	(182,853)
State taxes (net of federal tax benefit)	3,796	2,017	2,207
Increase in valuation allowance (net operating losses)	7,660	33,509	9,404
Foreign repatriation	510	4,030	46,356
Impairment of assets and other transaction costs	0	0	2,869
Reserve accrual (reversal) and audit settlements (net of federal tax benefit)	1,898	(2,874)	3,175
Foreign tax rate differential	(13,328)	(8,915)	(9,496)
Disallowed foreign interest, Subpart F income, and other foreign taxes	7,773	18,022	12,502
Other, net	3,589	(4,107)	3,713
(Benefit) Provision for Income Taxes	$ 44,944	$ 37,713	$ (97,275)