Shareholders' Equity (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Shareholders Equity Details 2
Earnings per share, basic	$ 0.30	$ 0.60	$ 3.30	$ 11.77
Net income allocable to common stock, basic	$ 6,999	$ 13,722	$ 75,835	$ 266,464
Net income per share of common stock and assumed conversions	$ 6,999	$ 13,722	$ 75,835	$ 266,464
Weighted Average Number Shares, basic	23,173,426	22,730,080	22,969,103	22,630,672
Warrants outstanding for the purchase of common stock	1,442,600	1,391,893	1,472,958	1,426,702
Weighted Average Number Shares, diluted	24,616,026	24,121,973	24,442,061	24,057,374
Earnings per share, diluted	$ 0.28	$ 0.57	$ 3.10	$ 11.08