Income Taxes (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ 2,945	$ 19,587	$ 43,296	$ 10,518	$ 25,272	$ 56,286	$ (19,256)	$ 36,269	$ 76,346	$ 98,571	$ 48,499
U.S. federal statutory rate									35.00%	35.00%	35.00%
Provision at statutory rate									$ 26,721	$ 34,500	$ 16,975
State income taxes—net of federal benefit									1,701	3,197	(577)
Effect of rates other than statutory									(2,306)	(1,925)	(1,041)
Effect of U.S. taxation on foreign branches									10,366	20,769	2,974
Foreign tax adjustment, prior years									7	(3,669)	4,533
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount									0	4,698	24,625
Noncontrolling interest									4,373	7,986	6,096
Foreign tax credit and offset to branch deferreds									(1,740)	6,851	(2,876)
Impact of valuation allowance on deferred tax assets									1,740	(7,331)	(53,218)
Foreign net gain on subsidiary dissolution and intercompany debt waivers									0	(13,620)	0
Foreign withholding taxes									6	5,054	0
Other, net									1,408	5,975	(2,553)
Provision (benefit) for income taxes	$ 3,921	$ 10,006	$ 14,861	$ 4,742	$ 12,569	$ 24,090	$ (6,672)	$ 16,526	$ 33,530	$ 46,513	$ (17,254)