Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss), net of tax	Non-controlling interest	Common Class A	Common Class B	Total
Beginning balance, Value at Dec. 31, 2017	$ 451,199	$ 8,400	$ 459	$ (410,934)	$ 2		$ 49,126
Beginning balance, Shares at Dec. 31, 2017					17,696,991	1
Net income		20,770		18,529			39,299
Distributions to non-controlling unitholders				(11,259)			(11,259)
Equity-based compensation and related dividend equivalents, value	6,206	(113)					6,093
Equity-based compensation and related dividend equivalents, shares					64,878
Dividends to Class A common stockholders		(10,645)					(10,645)
Change in accumulated other comprehensive income			(40)	(37)			(77)
Payroll taxes related to net settled restricted stock units	(895)						(895)
Payroll taxes related to net settled restricted stock units (in shares)					(15,685)
Other	516						516
Ending balance, Value at Sep. 30, 2018	$ 457,026	$ 18,412	$ 419	$ (403,701)	$ 2		$ 72,158
Ending balance, Shares at Sep. 30, 2018					17,746,184	1