Extinguishment of Senior Notes (Details) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2012	Sep. 30, 2011	Sep. 30, 2011
Extinguishment of Senior Notes (Textual) [Abstract]
Redeemed principle amount of senior notes	$ 61,800,000	$ 8,700,000	$ 34,600,000
Percentage of Senior Note Redeemed	8.625%
Senior notes due date	2014
Total consideration on redemption of senior notes	62,700,000	8,900,000	35,500,000
Accrued interest on redemption	1,800,000	263,000	572,000
Loss on extinguishment of debt	1,500,000	298,000	1,400,000
Unamortized debt issuance costs	$ 594,000	$ 98,000	$ 416,000