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Income Taxes - Reconciliation of Effective Tax Rate to Statutory Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation
Income taxes at U.S. federal statutory rate	$ 7,415	$ (14,917)	$ (31,297)
Net state income taxes	1,570	(4,693)	416
Tax Cuts and Jobs Act	0	(53,442)	0
Noncontrolling interest	(1,793)	(1,091)	3,204
Unrecognized tax benefits	(1,443)	9,566	(2,078)
Valuation allowances and write off of tax attributes	(58)	247	85
Indemnification revenue / expense	(44)	692	3,006
Executive compensation limitation	977	2,433	856
Stock	(455)	(858)	0
Other	(19)	980	1,204
Provision for (benefit from) income taxes	$ 6,150	$ (61,083)	$ (24,604)

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