Debt Retiring of Credit Facility & 7 1/2% Senior Notes (Details) (USD $)	3 Months Ended		0 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Feb. 05, 2013 7.875% Senior Notes	Dec. 31, 2013 7.5% Senior Notes [Member]	Dec. 31, 2013 Credit Facility Term Loan and Revolver [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Senior Long-term Debt			$ 457,000,000
Loss on debt extinguishment	(6,275,000)	0
Write off of Deferred Debt Issuance Cost				$ 1,000,000	$ 5,000,000