Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax on pre-tax book income (before reduction for noncontrolling interests)	$ 22,483	$ 17,693	$ 12,151
Tax effect of noncontrolled earnings post Transaction	(3,630)	(3,996)	(3,577)
State tax expense, net	1,213	1,153	533
Income tax expense (benefit) related to the Tax Act	19,017
Change in federal statutory tax rate		0	0
Other	(52)	531	64
Total income tax provision	$ 39,031	$ 15,381	$ 9,171
Effective income tax rate reconciliation, percent	60.80%	30.40%	26.40%