Consolidated Statements Of Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Non-Controlling Interest
Net Income Loss Available To Common Stockholders	$ 127,604
Balance, beginning at Dec. 31, 2012	72,119	$ 146	$ 74,168	$ (11,602)	$ 9,407
Balance, beginning (in shares) at Dec. 31, 2012		14,558
Net income	135,603			129,132	6,471
Cash contributions from members of consolidated entities	37,184				37,184
Cash distributions to members of consolidated entities	(30,447)				(30,447)
Conversion of redeemable preferred stock to Class A common stock	70,386	$ 93	70,293
Conversion of redeemable preferred stock to Class A common stock (in shares)		9,334
Issuance of common stock, net of offering costs	163,684	$ 72	163,612
Issuance of common stock, net of offering costs (in shares)		7,178
Issuance of restricted stock	0	$ 3	(3)
Issuance of restricted stock (in shares)		366
Stock based compensation	3,793		3,793
Preferred stock dividends	(1,528)			(1,528)
Balance, ending at Dec. 31, 2013	450,794	$ 314	311,863	116,002	22,615
Balance, ending (in shares) at Dec. 31, 2013		31,436
Net Income Loss Available To Common Stockholders	44,625
Net income	54,526			44,625	9,901
Cash contributions from members of consolidated entities	22,041				22,041
Cash distributions to members of consolidated entities	(27,326)				(27,326)
Exercise of stock options	285	$ 1	284
Exercise of stock options (in shares)		158
Issuance of common stock, net of offering costs	(105)		(105)
Shares remitted to Company to satisfy employee personal income tax liabilities resulting from share based compensation plans	(1,774)		(1,774)
Shares remitted to Company to satisfy employee personal income tax liabilities resulting from share based compensation plans (in shares)		(99)
Stock based compensation	6,114	$ 4	6,110
Stock based compensation (in shares)		392
Preferred stock dividends	0
Excess income tax benefit from stock based awards	1,866		1,866
Issuance of TEUs net of offering costs	90,725		90,725
Balance, ending at Dec. 31, 2014	597,146	$ 319	408,969	160,627	27,231
Balance, ending (in shares) at Dec. 31, 2014		31,887
Net Income Loss Available To Common Stockholders	57,336
Net income	60,261			57,336	2,925
Cash contributions from members of consolidated entities	19,850				19,850
Cash distributions to members of consolidated entities	(10,632)				(10,632)
Exercise of stock options	106		106
Exercise of stock options (in shares)		48
Shares remitted to Company to satisfy employee personal income tax liabilities resulting from share based compensation plans	(1,832)	$ (1)	(1,831)
Shares remitted to Company to satisfy employee personal income tax liabilities resulting from share based compensation plans (in shares)		(88)
Stock based compensation	6,570	$ 4	6,566
Stock based compensation (in shares)		331
Preferred stock dividends	0
Balance, ending at Dec. 31, 2015	$ 671,469	$ 322	$ 413,810	$ 217,963	$ 39,374
Balance, ending (in shares) at Dec. 31, 2015		32,178