CONDENSED CONSOLIDATED STATEMENT OF EQUITY - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Non-Controlling Interests
Beginning Balance at Dec. 31, 2017	$ 860,630	$ 392	$ 454,286	$ 325,794	$ 80,158
Beginning Balance (in shares) at Dec. 31, 2017		39,085
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,588			8,328	4,260
Cash contributions from members of consolidated entities	4,062				4,062
Cash distributions to members of consolidated entities	(17,106)				(17,106)
Repurchases of common stock	(5,000)	$ (2)	(4,998)
Repurchases of common stock (in shares)		(205)
Shares remitted to Company to satisfy employee tax obligations	(4,696)	$ (2)	(4,694)
Shares remitted to Company to satisfy employee tax obligations (in shares)		(186)
Stock based compensation expense	3,181	$ 5	3,176
Stock based compensation expense (in shares)		577
Ending Balance at Mar. 31, 2018	$ 853,659	$ 393	$ 447,770	$ 334,122	$ 71,374
Ending Balance (in shares) at Mar. 31, 2018		39,271