Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total USD ($)	Share Repurchase Plan [Member] USD ($)	Series A Preferred Stock [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] Share Repurchase Plan [Member]	Additional Paid-In Capital [Member] USD ($)	Additional Paid-In Capital [Member] Share Repurchase Plan [Member] USD ($)	Retained Income [Member] USD ($)	Accumulated Other Comprehensive Income, Net of Tax [Member] USD ($)
Beginning Balance at Dec. 31, 2012	$ 121,253					$ 63,875		$ 55,758	$ 1,620
Beginning Balance, shares at Dec. 31, 2012			241,182	10,877,537
Net income	50,000							50,000
Total other comprehensive income, net of income taxes	(449)								(449)
Conversion of preferred stock to common stock, shares			(91,263)	91,263
Issuance of restricted stock, shares				564,000
Exercise of common stock options, shares	0
Forfeiture of restricted stock, shares				(29,260)
Repurchase and retirement of common stock	(893)					(893)
Repurchase and retirement of common stock, shares				(26,705)
Common stock dividends	(7,600)							(7,600)
Preferred stock dividends	(88)							(88)
Tax benefits on stock-based compensation	892					892
Stock-based compensation	3,418					3,418
Ending Balance at Sep. 30, 2013	166,533					67,292		98,070	1,171
Ending Balance, shares at Sep. 30, 2013			149,919	11,476,835
Beginning Balance at Dec. 31, 2013	160,521					48,966		110,441	1,114
Beginning Balance, shares at Dec. 31, 2013			110,684	10,939,268
Net income	48,102							48,102
Total other comprehensive income, net of income taxes	(85)								(85)
Conversion of preferred stock to common stock, value
Conversion of preferred stock to common stock, shares			(107,298)	107,298
Issuance of restricted stock, value
Issuance of restricted stock, shares				108,720
Exercise of common stock options, value	125					125
Exercise of common stock options, shares	50,000			50,000
Forfeiture of restricted stock, value
Forfeiture of restricted stock, shares				(8,485)
Repurchase and retirement of common stock	(616)	(27,815)				(616)	(27,815)
Repurchase and retirement of common stock, shares		(734,924)		(14,070)	(734,924)
Redemption of Series A preferred stock	(34)					(25)		(9)
Redemption of Series A preferred stock, shares			(3,386)
Deferred taxes on debt discount	215					215
Common stock dividends	(8,828)							(8,828)
Preferred stock dividends	4							4
Tax benefits on stock-based compensation	1,384					1,384
Stock-based compensation	6,600					6,600
Ending Balance at Sep. 30, 2014	$ 179,573					$ 28,834		$ 149,710	$ 1,029
Ending Balance, shares at Sep. 30, 2014				10,447,807