Shareholders' Equity and Earnings Per Share - Series C Preferred Stock (Details) - Series C convertible perpetual preferred stock	Jun. 21, 2010 $ / shares shares
Series C Preferred Stock
Preferred stock, shares issued | shares	21,004
Conversion price (in dollars per share) | $ / shares	$ 3.75
Number of common stock into which preferred stock are convertible (in shares) | shares	5,601,000
Liquidation preference (in dollars per share) | $ / shares	$ 1,000