Debt (7.75% Senior Notes) (Details) (USD $)	12 Months Ended				0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2012	Aug. 31, 2010	Nov. 04, 2013 Senior Notes 7.75% Senior Notes	Dec. 31, 2013 Senior Notes 7.75% Senior Notes	Oct. 03, 2013 Senior Notes 7.75% Senior Notes	Oct. 20, 2009 Senior Notes 7.75% Senior Notes
Debt Instrument [Line Items]
Stated interest rate				8.47%		7.75%
Proceeds from issuance of debt								$ 250,000,000
Repurchased face amount							209,100,000
Loss on early extinguishment of debt	(20,657,000)	(8,462,000)	0		(17,700,000)
Proceeds from Hedge, Financing Activities					$ 4,000,000