Income Taxes (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes	$ 9,503	$ 5,764	$ (6,339)	$ (9,952)	$ 33,760	$ (56,352)	$ 13,236	$ (10,182)	$ (1,024)	$ (19,538)	$ 24,531
U.S. federal statutory rate									21.00%	35.00%	35.00%
Provision at statutory rate									$ (215)	$ (6,838)	$ 8,586
State income taxes—net of federal benefit									13	401	(498)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount									(3,042)	3,842	1,966
Effect of U.S. taxation on foreign branches									11,023	15,710	8,854
Noncontrolling interest									508	0	3,908
Foreign tax credit and offset to branch deferreds									1,447	45,245	(6,026)
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount									(3,012)	(7,514)	0
Impact of valuation allowance on deferred tax assets									0	(65,327)	6,026
Foreign withholding taxes									10,187	858	18
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount									1,427	1,351	0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount									0	17,638	0
Other, net									(100)	(70)	182
Provision (benefit) for income taxes	$ 6,531	$ (2,697)	$ (3,613)	$ 23,083	$ 31,141	$ (37,249)	$ 3,625	$ 95	$ 23,304	$ (2,388)	$ 11,268