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Income Taxes and Deferred Tax Asset/Liability - Summary Reconciliation Reported Amount of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax expense (benefit) at the U.S. federal statutory rate	$ 6,568	$ 5,577	$ (2,563)
State tax based on income, net of refunds and federal benefits	364	(264)	(113)
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners	(4,097)	(5,504)	(3,786)
Valuation allowance	(1,013)	(18,006)	6,919
Tax credits	(286)	(349)	(1,258)
Tax rate change	(281)	19,545	0	$ 19,300
Return to provision	21	(62)	400
Earn-out liability	0	460	433
Equity compensation	26	(1,371)	0
Other permanent differences	436	92	56
Total tax expense	$ 1,738	$ 118	$ 88
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax expense (benefit) at the U.S. federal statutory rate	21.00%	35.00%	35.00%
State tax based on income, net of refunds and federal benefits	1.20%	(1.70%)	1.50%
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners	(13.10%)	(34.50%)	51.70%
Valuation allowance	(3.30%)	(113.00%)	(94.50%)
Tax credits	(0.90%)	(2.20%)	17.20%
Tax rate change	(0.90%)	122.70%	0.00%
Return to provision	0.10%	(0.40%)	(5.50%)
Earn-out liability	0.00%	2.90%	(5.90%)
Equity compensation	0.10%	(8.60%)	0.00%
Other permanent differences	1.40%	0.60%	(0.80%)
Effective income rate, percent	5.60%	0.80%	(1.30%)

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