Consolidated Statements of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($)	Additional paid-in capital	(Accumulated deficit) retained earnings	Accumulated other comprehensive income	Non-controlling interest	Common Class A	Common Class B	Total
Balances, January 1, 2017 at Dec. 31, 2016	$ 448,713,000	$ 16,005,000	$ (28,000)	$ (403,983,000)	$ 2,000		$ 60,709,000
Beginning balance, Shares at Dec. 31, 2016					17,652,548	1
Net income		16,277,000		16,968,000			33,245,000
Distributions to non-controlling unitholders				(14,213,000)			(14,213,000)
Equity-based compensation expense and related dividend equivalents, value	2,161,000	(53,000)				$ 0	2,108,000
Equity-based compensation expense and related dividend equivalents, shares					58,426
Dividends to Class A common stockholders		(9,554,000)			$ (9,554,000)		(9,554,000)
Change in accumulated other comprehensive income			467,000	532,000			999,000
Payroll taxes related to net settled restricted stock units	(816,000)	0					(816,000)
Payroll taxes related to net settled restricted stock units (in shares)					(13,983)
Other	259,000						259,000
Ending balance, Value at Sep. 30, 2017	$ 450,317,000	$ 22,675,000	$ 439,000	$ (400,696,000)	$ 2,000		$ 72,737,000
Ending balance, Shares at Sep. 30, 2017					17,696,991	1