LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Debt Instruments (Details)	3 Months Ended		6 Months Ended				1 Months Ended	6 Months Ended						6 Months Ended	12 Months Ended			6 Months Ended				1 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended			12 Months Ended				6 Months Ended				6 Months Ended				3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Apr. 30, 2012 T W Loan 2013 Convert Note tranche [Member] USD ($)	Oct. 31, 2010 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2012 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2012 2013 Convertible Notes [Member] USD ($)	Apr. 30, 2012 2013 Convertible Notes [Member] USD ($)	Dec. 31, 2011 2013 Convertible Notes [Member] USD ($)	Mar. 31, 2008 2013 Convertible Notes [Member] USD ($)	Mar. 10, 2008 2013 Convertible Notes [Member]	Jun. 30, 2012 2013 Convertible Notes [Member] Common Class A [Member] USD ($)	Dec. 31, 2011 2013 Convertible Notes [Member] Capped Purchase Call Option [Member] USD ($)	Jun. 30, 2012 2013 Convertible Notes [Member] Capped Purchase Call Option [Member] USD ($)	Jun. 30, 2012 2013 Convertible Notes [Member] Capped Purchase Call Option [Member] Common Class A [Member]	Jun. 30, 2012 2013 Convertible Notes [Member] Capped Purchase Call Option [Member] Minimum [Member] Common Class A [Member] USD ($)	Jun. 30, 2012 2013 Convertible Notes [Member] Capped Purchase Call Option [Member] Maximum [Member] Common Class A [Member] USD ($)	Jun. 30, 2012 2013 Convertible Notes [Member] BNP Parabis [Member] Common Class A [Member]	Jun. 30, 2012 2013 Convertible Notes [Member] Deutsche Bank [Member] Common Class A [Member]	Sep. 30, 2011 Repurchase of 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2012 Repurchase of 2013 Convertible Notes [Member] USD ($)	Apr. 30, 2012 T W Loan 2014 Floating Rate Note tranche [Member]	Jun. 30, 2012 Floating Rate Notes [Member] USD ($)	Jun. 30, 2011 Floating Rate Notes [Member] USD ($)	Jun. 30, 2012 Floating Rate Notes [Member] USD ($)	Jun. 30, 2012 Floating Rate Notes [Member] EUR (€)	Jun. 30, 2011 Floating Rate Notes [Member] USD ($)	Dec. 31, 2010 Floating Rate Notes [Member] USD ($)	Dec. 31, 2010 Floating Rate Notes [Member] EUR (€)	Dec. 31, 2011 Floating Rate Notes [Member] USD ($)	May 16, 2007 Floating Rate Notes [Member] USD ($)	Jun. 30, 2012 2015 Convertible Notes [Member] USD ($)	Jun. 30, 2012 2015 Convertible Notes [Member] USD ($)	Dec. 31, 2011 2015 Convertible Notes [Member] USD ($)	Feb. 18, 2011 2015 Convertible Notes [Member]	Jun. 30, 2012 2015 Convertible Notes [Member] Common Class A [Member] USD ($)	Jun. 30, 2012 2015 Convertible Notes [Member] September 15, 2013 to September 14, 2014 [Member]	Jun. 30, 2012 2015 Convertible Notes [Member] September 15, 2014 to September 14, 2015 [Member]	Jun. 30, 2012 2015 Convertible Notes [Member] September 15, 2015 and thereafter [Member]	Jun. 30, 2012 Refinance of 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2011 Refinance of 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2012 Refinance of 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2011 Refinance of 2013 Convertible Notes [Member] USD ($)	Dec. 31, 2011 Refinance of 2013 Convertible Notes [Member] USD ($)	Jun. 30, 2012 2016 Fixed Rate Notes [Member] USD ($)	Jun. 30, 2011 2016 Fixed Rate Notes [Member] USD ($)	Jun. 30, 2012 2016 Fixed Rate Notes [Member] USD ($)	Jun. 30, 2011 2016 Fixed Rate Notes [Member] USD ($)	Dec. 31, 2011 2016 Fixed Rate Notes [Member] USD ($)	Dec. 31, 2011 2016 Fixed Rate Notes [Member] EUR (€)	Dec. 31, 2010 2016 Fixed Rate Notes [Member] USD ($)	Dec. 31, 2010 2016 Fixed Rate Notes [Member] EUR (€)	Dec. 31, 2009 2016 Fixed Rate Notes [Member]	Sep. 29, 2009 2016 Fixed Rate Notes [Member] EUR (€)	Sep. 17, 2009 2016 Fixed Rate Notes [Member] EUR (€)	Jun. 30, 2012 Fixed Rate 2017 Notes [Member] USD ($)	Dec. 31, 2011 Fixed Rate 2017 Notes [Member] USD ($)	Oct. 21, 2010 Fixed Rate 2017 Notes [Member] USD ($)	Oct. 21, 2010 Fixed Rate 2017 Notes [Member] EUR (€)	Jun. 30, 2012 Fixed Rate 2017 Notes [Member] November 1, 2014 to October 31, 2015 [Member]	Jun. 30, 2012 Fixed Rate 2017 Notes [Member] November 1, 2015 to October 31, 2016 [Member]	Jun. 30, 2012 Fixed Rate 2017 Notes [Member] November 1, 2016 and thereafter [Member]	Apr. 30, 2012 T W Loan 2016 Fixed Rate Note tranche [Member] T W Loan 2014 Floating Rate Note tranche [Member] USD ($)
Debt Instrument [Line Items]
(Loss) / gain on extinguishment	$ (448,000)	$ 3,424,000	$ (448,000)	$ 24,979,000																			$ 3,763,000		$ (4,211,000)	$ 0	$ (4,211,000)		$ 0													$ 3,763,000	$ 3,424,000	$ 3,763,000	$ 22,591,000		$ 0	$ 0	$ 0	$ 2,388,000
Unamortized debt costs included in (loss) / gain on extinguishment			897,000																				370,000				527,000
Adjustment to additional paid-in capital			868,000																				868,000				0
Debt Instrument Price Redemption Percentage																									100.00%		100.00%	100.00%											105.813%	102.906%	100.00%																					104.50%	102.25%	100.00%
Debt Instrument, Interest Rate, Stated Percentage						3.50%							3.50%											1.625%													5.00%																		11.625%					9.00%	9.00%
Debt Issuance Redemption Cash Consideration																																														35,400,000
Debt Instrument, Interest Rate, Effective Percentage																									2.60%		2.60%	2.60%
Percentage Of Original Principle Amount Able To Be Redeemed																																																										35.00%
Redemption Percentage Of Principle Amount																																																										109.00%
Debt Instrument, Convertible, Effective Interest Rate								10.30%																										10.00%
Beneficial Ownership Interest Total Voting Power Percentage	35.00%		35.00%
Carrying Value Of Senior Debt	1,045,325,000		1,045,325,000		1,243,207,000			19,828,000			121,230,000														110,163,000		110,163,000					191,497,000		227,468,000		223,341,000											473,834,000		473,834,000		487,176,000							214,032,000	219,963,000
Long-term Debt, Fair Value	1,058,474,000		1,058,474,000		1,002,890,000			20,672,000			117,926,000														102,729,000		102,729,000					141,708,000		226,400,000		163,276,000											484,016,000		484,016,000		373,215,000							224,657,000	206,765,000
Debt Instrument, Convertible, Number of Equity Instruments																																						20
Debt Instruments Convertible Number Of Equity Units														9.5238
Debt Instrument Convertible Principle Amount														1,000																								1,000
Debt Instrument, Convertible, Conversion Price														$ 105.00																								$ 50.00
Option Indexed to Issuer's Equity, Indexed Shares																	2,940,477			1,583,333	1,357,144
Option Indexed to Issuer's Equity, Strike Price																		$ 105.00	$ 151.20
Class A Common Shares Capped Call Options Unexercisable Remaining																	196,638
Reclassification Of Capped Call Options			0	0											21,100,000
Debt Instrument, Face Amount						129,700,000				20,647,000	129,660,000	475,000,000																					150,000,000	261,034,000		261,034,000										261,000,000										240,000,000	200,000,000			214,000,000	170,000,000				170,000,000
Debt Instrument, Basis Spread on Variable Rate																																	1.625%
Debt Instrument, Unamortized Discount								(819,000)			(8,430,000)																							(33,566,000)		(37,693,000)
Debt Instrument, Convertible, Carrying Amount of Equity Component								102,369,000	101,501,000																									11,907,000	11,907,000
Debt Instrument, Step Refinancing, Cumulative Principal Issued Redeemed								(109,013,000)
Debt Instrument, Step Refinancing, Redemption, Cumulative Unamortized Discount								4,537,000
Debt Instrument, Step Refinancing, Reduction In Carrying Value								104,476,000
Debt Instrument, Step Refinancing, Redemption, Reduction In Equity Component								(868,000)
Amortization Of Debt Issuance Discount Relating To Unamortized Discount	(1,590,000)	4,502,000	1,968,000	9,249,000				3,074,000																										4,127,000
Repurchase Price Required Percentage To Repurchase																									101.00%		101.00%	101.00%																			101.00%		101.00%									101.00%
Debt Issuance Redemption Cash Consideration Recieved Portion Related To Accrued Interest																																														3,300,000
Debt Issuance Redemption Discount Premium Percentage Of Principle Amount																																																								102.75%	98.261%
Extinguishment of Debt, Amount							34,800,000															49,500,000	109,000,000				75,800,000	60,500,000		2,800,000	2,000,000																				24,000,000	17,000,000	67,100,000	48,400,000
Early Repayment of Senior Debt			180,087,000	26,252,000			30,700,000															47,400,000	109,000,000				71,100,000	56,700,000		2,300,000	1,600,000																				26,300,000	18,600,000	68,500,000	49,300,000
Class A Common Shares Capped Call Options Unexercisable Remaining Value																$ 0