Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax on pre-tax book income (before reduction for noncontrolling interests)	$ 17,693	$ 12,151	$ 12,673
Pre-Transaction earnings taxed to partners	0	0	(10,634)
Tax effect of non-controlled earnings post Transaction	(3,996)	(3,577)	(644)
Change in partnership tax status	0	0	(25,244)
Change in partnership tax status - state benefit	0	0	(1,320)
State tax expense, net	1,153	533	315
Deferred other	0	(36)	0
Other	531	100	1
Total income tax provision (benefit)	$ 15,381	$ 9,171	$ (24,853)
Effective income tax rate reconciliation, percent	30.40%	26.40%	(68.60%)