Convertible Preferred Stock (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Rate
Convertible Preferred Stock (Textual) [Abstract]
Series B cumulative convertible perpetual preferred stock interest rate	6.875%
Terms of applicable conversion terms	if the closing sale price of the Company’s common stock for 20 trading days within a period of 30 consecutive trading days ending on the trading day immediately preceding the date the Company gives the conversion notice equals or exceeds 130% of the conversion price in effect on each such trading day. Each share of Series B Preferred Stock may be converted at any time, at the option of the holder, into 3.4433 shares of the Company’s common stock (which is based on an initial conversion price of approximately $14.52 per share of common stock, subject to adjustment) plus cash in lieu of fractional shares, subject to the Company’s right to settle all or a portion of any such conversion in cash or shares of the Company’s common stock. If the Company elects to settle all or any portion of its conversion obligation in cash, the conversion value and the number of shares of the Company’s common stock it will deliver upon conversion (if any) will be based upon a 20 trading day averaging period.
Number of trading days	20 days
Number of consecutive trading days	30 days
Closing price as percentage of conversion price	130.00%
Series B Preferred Stock converted into common stock (in shares)	3.4433
Initial conversion price of common stock (in usd per share)	$ 14.52
Applicable settlement terms	If the Company elects to settle all or any portion of its conversion obligation in cash, the conversion value and the number of shares of the Company’s common stock it will deliver upon conversion (if any) will be based upon a 20 trading day averaging period.
Conversion rate numerator for Preferred Stock	$ 50