Stockholders' Equity (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of activity for restricted stock grants
Non-vested at beginning of year, Shares	248,804	131,333	179,500
Non-vested at beginning of year, Weighted Average Grant Date Fair Value	$ 8.43	$ 10.58	$ 19.56
Granted, Shares	288,648	165,638	134,500
Granted, Weighted Average Grant Date Fair Value	$ 12.18	$ 7.22	$ 11.20
Vested, Shares	(72,471)	(43,167)	(141,667)
Vested, Weighted Average Grant Date Fair Value	$ 7.81	$ 10.47	$ 22.29
Forfeited, Shares	(6,000)	(5,000)	(41,000)
Forfeited, Weighted Average Grant Date Fair Value	$ 10.91	$ 7.34	$ 11.46
Non-vested at end of year, Shares	458,981	248,804	131,333
Non-vested at end of year, Weighted Average Grant Date Fair Value	$ 10.85	$ 8.43	$ 10.58