Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands, except Share data		Total	Common Stock	Additional Paid-in Capital	Accumulated (Losses) Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning Balance, Value at Dec. 31, 2010		$ 339,613	$ 721	$ 359,610	$ (20,576)	$ (142)
Beginning Balance, Shares at Dec. 31, 2010			72,066,248
Issuance of common stock		2,641	5	2,636
Issuance of common stock, Shares			688,200
Share-based compensation recognized		884		884
Net (loss) income		24,214			24,214
Other comprehensive income (loss)		(1,176)				(1,176)
Ending Balance, Value at Dec. 31, 2011		366,176	726	363,130	3,638	(1,318)
Ending Balance, Shares at Dec. 31, 2011			72,754,448
Issuance of common stock		450	2	448
Issuance of common stock, Shares			91,696
Share-based compensation recognized		1,204		1,204
Dividends	[1]	(323,217)		(312,627)	(10,590)
Net (loss) income		77,366			77,366
Other comprehensive income (loss)		476				476
Ending Balance, Value at Dec. 31, 2012		122,455	728	52,155	70,414	(842)
Ending Balance, Shares at Dec. 31, 2012		72,846,144	72,846,144
Issuance of common stock		112,432	63	112,369
Issuance of common stock upon initial public offering, net of offering costs, Shares			6,250,000
Share-based compensation recognized		6,179		6,179
Tax windfall benefit on exercises of stock options and vesting of restricted stocks		1,829		1,829
Stock options exercised, net of cashless exercise		(16,822)	29	(16,851)
Stock options exercised, net of cashless exercised, Shares			2,880,357
Repurchase of common stock		(75,000)	(37)	(74,963)
Repurchase of common stock, Shares			(3,690,036)
Net (loss) income		(24,621)			(24,621)
Cash dividends paid on common stock		(16,390)			(16,390)
Other comprehensive income (loss)		1,268				1,268
Ending Balance, Value at Dec. 31, 2013		$ 111,330	$ 783	$ 80,718	$ 29,403	$ 426
Ending Balance, Shares at Dec. 31, 2013		78,286,465	78,286,465

[1] (1) Includes an equitable adjustment to holders of outstanding stock options in consideration to dividends declared on December 18, 2012 amounting to approximately $3.6 million.