Convertible Notes, Long-Term Debt and Credit Facility - Convertible Notes (Details) (2008 Notes [Member], USD $) In Millions, unless otherwise specified	Feb. 15, 2013
2008 Notes [Member]
Debt Instrument [Line Items]
Notes repurchased	$ 5.2

Face (par) amount of the original debt instrument that was repurchased.

No definition available.

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant