CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Gain [Member]
Beginning Balance at Dec. 31, 2012	$ 449,848	$ 827	$ 456,923	$ (6,648)	$ (1,254)
Beginning Balance, shares at Dec. 31, 2012		82,737,008
Equity-based compensation	2,222	1	2,221
Equity-based compensation, shares		74,561
Unrealized gain (loss) on derivatives, net of tax	2,580				2,580
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		0	0
Vesting of restricted shares, shares		8,909
Dividend declared to stockholders	(18,072)		(18,072)
Net income (loss)	(56,214)			(56,214)
Ending Balance at Jun. 30, 2013	$ 625,805	$ 896	$ 686,445	$ (62,862)	$ 1,326
Ending Balance, shares at Jun. 30, 2013		89,603,759