Stockholder's Equity (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity [Line Items]
Common stock issued on conversion of preferred stock	0
Preferred Stock, Shares Outstanding	26,224,854	37,224,854	26,224,854	25,724,854
Preferred stock, shares issued during period	0	11,500,000
Preferred stock redeemed, shares	0	0
Preferred stock balance average rate	0.06493	0.06855	0.06493	0.07013
Preferred stock balance issued average rate	0.000	0.06500
Preferred stock balance redeemed average rate	0.000	0.000
Preferred stock redemption charge	$ 0	$ 0