CONVERTIBLE NOTES (DETAILS) (USD $)	6 Months Ended
	Jun. 30, 2011
Convertible Senior Notes Due 2032 Member
Debt Instrument [Line Items]
Debt Instrument Principal Amount	$ 169,100,000
Stated Interest Rate	2.50%
Stated Contingent Interest Rate	0.50%
Contingent Interest Payable	100,000
Contingent Interest Rate Terms	The Company also agreed to pay contingent interest at a rate equal to 0.5% per annum during any six-month period, with the initial six-month period commencing June 4, 2007, if the average trading price of the Old Notes reaches certain thresholds.
Debt Instrument Convertible Terms Of Conversion Feature	The Old Notes are convertible, at the holders’ option, prior to the maturity date into shares of the Company’s Class A common stock in the following circumstances: during any quarter commencing after June 30, 2002, if the closing price of the Company’s Class A common stock over a specified number of trading days during the previous quarter, including the last trading day of such quarter, is more than 110% of the conversion price of the Old Notes, or $31.96. The Old Notes are initially convertible at a conversion price of $29.05 per share, which is equal to a conversion rate of approximately 34.4234 shares per $1,000 principal amount of Old Notes, subject to adjustment; if the Company has called the Old Notes for redemption; during the five trading day period immediately following any nine consecutive day trading period in which the trading price of the Old Notes per $1,000 principal amount for each day of such period was less than 95% of the product of the closing sale price of the Company’s Class A common stock on that day multiplied by the number of shares of the Company’s Class A common stock issuable upon conversion of $1,000 principal amount of the Old Notes; or upon the occurrence of specified corporate transactions.
Debt Instrument Fee Amount	12,600,000
Deferred Tax Liability Convertible Debt	57,900,000
Convertible Senior Notes Due 2033 Member
Debt Instrument [Line Items]
Debt Instrument Principal Amount	181,000
Stated Interest Rate	1.50%
Stated Contingent Interest Rate	0.50%
Contingent Interest Rate Terms	The Company will also pay contingent interest at a rate of 0.5% per annum during any six-month period, with the initial six-month period commencing June 4, 2008, if the average trading price of the New Notes reaches certain thresholds.
Debt Instrument Convertible Terms Of Conversion Feature	The remaining New Notes are convertible, at the holders’ option, prior to the maturity date into shares of the Company’s Class A common stock in the following circumstances: during any quarter commencing after September 30, 2003, if the closing price of the Company’s Class A common stock over a specified number of trading days during the previous quarter, including the last trading day of such quarter, is more than 120% of the conversion price of the New Notes, or $46.51. The Notes are initially convertible at a conversion price of $38.76 per share, which is equal to a conversion rate of approximately 25.7998 shares per $1,000 principal amount of New Notes, subject to adjustment; if the Company has called the New Notes for redemption; during the five trading day period immediately following any nine consecutive day trading period in which the trading price of the New Notes per $1,000 principal amount for each day of such period was less than 95% of the product of the closing sale price of the Company’s Class A common stock on that day multiplied by the number of shares of the Company’s Class A common stock issuable upon conversion of $1,000 principal amount of the New Notes; or upon the occurrence of specified corporate transactions.
Debt Instrument Fee Amount	$ 5,100,000