Long Term Debt (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Jul. 26, 2012
Long-term Debt, Unclassified [Abstract]
Debt Instrument, Issuance Date	Jul. 26, 2012
Debt Instrument, Face Amount	$ 250,000,000	$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage	8.00%	8.00%
Debt Instrument, Maturity Date	Aug. 01, 2020
Proceeds from Debt, Net of Issuance Costs	245,000,000
Debt Instrument, Unamortized Discount	4,500,000	4,500,000		5,000,000
Debt Issuance Cost	1,300,000
Debt Instrument, Frequency of Periodic Payment	semi-annually
Debt Instrument, Date of First Required Payment	Feb. 01, 2013
Debt Instrument, Call Date, Earliest	Aug. 01, 2016
Debt Instrument [Line Items]
Long-term Debt	245,548,000	245,548,000	245,194,000
Long-term Debt, Current Maturities	0	0
Total long-term debt, less current portion	245,548,000	245,548,000
Long-term Debt, Fair Value	274,000,000	274,000,000	275,458,000
Interest Paid		$ 20,300,000