Subsequent Events (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified			3 Months Ended	1 Months Ended		1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Subsequent Event [Member]	Apr. 30, 2013 Senior PIK Toggle Notes [Member] Subsequent Event [Member]	Apr. 03, 2013 Senior PIK Toggle Notes [Member] Subsequent Event [Member]	Apr. 30, 2013 Equity Tender [Member] Subsequent Event [Member]	Apr. 05, 2013 Equity Tender [Member] Subsequent Event [Member]
Subsequent Events (Textual) [Abstract]
Senior unsecured notes principal amount	$ 450,000	$ 450,000			$ 175,000
Issue price					99.50%
Net proceeds				171,063
Gross proceeds				175,000
Discount payable to initial purchasers					3,063
Issue price discount				875
Escrow fund release amount					150,000
Equity tender escrow release date			Jul. 01, 2013
Purchase of common stock							4,651,162
Purchase price of common stock per share						$ 43.00
Purchase price of common stock						$ 200,000
Senior secured PIK Toggle note maturity period				2018