Income Taxes - Reconciliation of Income Tax Computed At U. S. Federal Statutory Rate to Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate			$ (5,084)	$ (3,821)	$ 1,506
State taxes, net of federal benefit			(554)	(543)	(1,374)
Noncontrolling interest			(372)	(252)	(455)
Non-deductible items			759	625	2,676
Foreign tax (benefit) expense			(58)	180	175
Valuation allowances	$ 35,800		36,224	0	(45,354)
Uncertain tax positions			400	1,629	1,145
Return to provision			0	(458)	0
Federal rate change		$ 8,000	0	0	8,011
Other			417	162	(831)
Income tax expense (benefit)			$ 31,732	$ (2,478)	$ (34,501)