Long-Term Debt -Senior Notes (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 2019 Senior Notes, due 2019 [Member]	Mar. 20, 2014 2019 Senior Notes, due 2019 [Member]	Dec. 31, 2013 2019 Senior Notes, due 2019 [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Accrued Interest Paid to Lenders				$ 1,000,000
Net loss on extinguishments of long-term debt	5,400,000	3,900,000	2,700,000
Long-term Debt, stated interest rate			8.50%
Debt, short-term and long-term			1,280,000,000		1,305,000,000
Premium, unamortized			4,000,000		4,200,000
Debt Instrument, Repurchased Face Amount				25,000,000
Redemption Premium, percentage of par value				109.75%
Extinguishment of Debt, Fees Paid to Lenders				2,400,000
Write off of Deferred Debt Issuance Cost			$ 300,000