Convertible Notes, Long-Term Debt and Credit Facility - Additional Disclosures (Details) (USD $)	0 Months Ended	24 Months Ended
Jan. 22, 2013	Dec. 31, 2012	Feb. 11, 2008
Debt Disclosure [Abstract]
Share lending agreement, number of common stock shares loaned			3,800,000
Own share lending arrangement nominal loan fee per share			$ 0.0001
Return of borrowed shares, in shares	2,439,558	1,360,442

The number of shares issued in connection with an own-share lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 2A

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=7656903&loc=SL6757479-112611

Name:	us-gaap_OwnshareLendingArrangementSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant