Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	(Accumulated Deficit) Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock, at Cost [Member]
Beginning Balance at Dec. 31, 2012	$ 442,301	$ 827	$ 456,923	$ (14,195)	$ (1,254)
Beginning Balance, shares at Dec. 31, 2012		82,737,008
Equity-based compensation	6,026	$ 1	6,025
Equity-based compensation, shares		74,561
Unrealized gain (loss) on derivatives, net of tax	1,265				1,265
Issuance of common stock in initial public offering, net of underwriter commissions and offering costs	245,441	$ 100	245,341
Issuance of common stock in initial public offering, net of underwriter commissions and offering costs, shares		10,000,000
Conversion of common stock into unvested restricted shares		$ (32)	32
Conversion of common stock into unvested restricted shares, shares		(3,216,719)
Vesting of restricted shares		$ 3	(3)
Vesting of restricted shares, shares		334,066
Shares withheld for tax withholdings	(852)		(852)
Shares withheld for tax withholdings, shares		(28,463)
Cash dividends declared to stockholders, net of forfeitures	(53,911)		(18,072)	(35,839)
Repurchase of shares of treasury stock, at cost	(44,163)					$ (44,163)
Net income	51,920			51,920
Ending Balance at Dec. 31, 2013	648,027	$ 899	689,394	1,886	11	(44,163)
Ending Balance, shares at Dec. 31, 2013		89,900,453
Equity-based compensation	2,349		2,349
Unrealized gain (loss) on derivatives, net of tax	(494)				(494)
Vesting of restricted shares		$ 3	(3)
Vesting of restricted shares, shares		299,583
Shares withheld for tax withholdings	(213)		(213)
Shares withheld for tax withholdings, shares		(8,936)
Cash dividends declared to stockholders, net of forfeitures	(54,345)		(36,056)	(18,289)
Repurchase of shares of treasury stock, at cost	(65,708)					(65,708)
Net income	49,919			49,919
Ending Balance at Dec. 31, 2014	$ 579,535	$ 902	655,471	33,516	(483)	(109,871)
Ending Balance, shares at Dec. 31, 2014	90,191,100	90,191,100
Equity-based compensation	$ 6,527		6,527
Unrealized gain (loss) on derivatives, net of tax	(12,654)				(12,654)
Vesting of restricted shares		$ 2	(2)
Vesting of restricted shares, shares		171,495
Shares withheld for tax withholdings	(844)	$ (1)	(843)
Shares withheld for tax withholdings, shares		(42,221)
Cash dividends declared to stockholders, net of forfeitures	(72,577)		(36,388)	(36,189)
Repurchase of shares of treasury stock, at cost	(45,000)					(45,000)
Net income	49,133			49,133
Ending Balance at Dec. 31, 2015	$ 504,120	$ 903	$ 624,765	$ 46,460	$ (13,137)	$ (154,871)
Ending Balance, shares at Dec. 31, 2015	90,320,374	90,320,374