Long-Term Debt and Credit Facility Long-Term Debt and Credit Facility (Repaid Convertible Notes and Share Lending Agreement) (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jan. 22, 2013	Feb. 11, 2008	Dec. 31, 2013	Dec. 31, 2012	Feb. 15, 2013
Debt Instrument [Line Items]
Share lending agreement, number of common stock shares loaned		3,800,000
Own share lending arrangement nominal loan fee per share (in dollars per share)		$ 0.0001
Period after payment date that the Borrower agreed to pay the Company an amount equal to any cash dividends that the Company paid on the Borrowed Shares		1 day
Return of borrowed shares under share-based, shares	2,439,558		2,439,558	1,360,442
2008 Notes [Member]
Debt Instrument [Line Items]
Notes repurchased					$ 5.2