Long-Term Obligations (Details Textual)	9 Months Ended
Sep. 30, 2012
2010 senior credit facility term loan due 2016 [Member]
Long-Term Obligations (Textual) [Abstract]
Maturity year of senior credit facility term loan - start	2010
Maturity year of senior credit facility term loan - end	2016
6.25% convertible notes due 2018 [Member]
Long-Term Obligations (Textual) [Abstract]
Interest rate of convertible notes	6.25%
Maturity year of convertible notes	2018
5.75% convertible notes due 2013 [Member]
Long-Term Obligations (Textual) [Abstract]
Interest rate of convertible notes	5.75%
Maturity year of convertible notes	2013

The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 6

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6036836-161870

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 33

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration