The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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

-Publisher FASB

-Name Accounting Standards Codification

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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+ Details

LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes (Details) (USD $)				3 Months Ended				3 Months Ended
	Mar. 31, 2013	Mar. 10, 2008 2013 Convertible Notes [Member]	Dec. 31, 2011 Refinance of 2013 Convertible Notes [Member]	Mar. 31, 2013 2015 Convertible Notes [Member]	Dec. 31, 2012 2015 Convertible Notes [Member]	Dec. 31, 2011 2015 Convertible Notes [Member]	Feb. 18, 2011 2015 Convertible Notes [Member]	Mar. 31, 2013 2015 Convertible Notes [Member] Class A Common Stock [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.50%					5.00%
Debt Instrument, Face Amount			$ 261,000,000	$ 261,034,000	$ 261,034,000	$ 261,000,000
Debt Instrument, Convertible, Number of Equity Instruments								20
Debt Instrument Convertible Principle Amount								$ 1,000
Debt Instrument, Convertible, Conversion Price								$ 50.00
Beneficial Ownership Interest Total Voting Power Percentage	35.00%			50.00%
Debt Instrument, Convertible, Effective Interest Rate				10.00%