NOTES PAYABLE AND COMMERCIAL BANK FINANCING (Details) (USD $)	9 Months Ended		0 Months Ended			1 Months Ended	0 Months Ended		3 Months Ended	9 Months Ended	0 Months Ended			0 Months Ended						0 Months Ended					1 Months Ended		1 Months Ended			3 Months Ended	0 Months Ended			1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Oct. 23, 2013 Subsequent Event Bank Credit Agreement	Apr. 09, 2013 Term Loan A Bank Credit Agreement	Oct. 23, 2013 Term Loan A Subsequent Event Bank Credit Agreement	Oct. 31, 2013 Term Loan A Subsequent Event Bank Credit Agreement	Oct. 23, 2013 Term Loan A Subsequent Event Bank Credit Agreement LIBOR	Apr. 09, 2013 Term Loan B Bank Credit Agreement	Sep. 30, 2013 Term Loan B Bank Credit Agreement	Sep. 30, 2013 Term Loan B Bank Credit Agreement	Oct. 23, 2013 Term Loan B Subsequent Event Bank Credit Agreement	Oct. 23, 2013 Term Loan B Subsequent Event Bank Credit Agreement LIBOR	Sep. 30, 2013 6.375% Senior Notes, due 2021	Oct. 11, 2013 6.375% Senior Notes, due 2021 Subsequent Event	Oct. 11, 2013 6.375% Senior Notes, due 2021 Subsequent Event Period beginning on November 1, 2016	Oct. 11, 2013 6.375% Senior Notes, due 2021 Subsequent Event Period on or prior to November 1, 2016	Jun. 28, 2013 5.375% Senior Unsecured Notes, due 2021	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021	Sep. 30, 2013 5.375% Senior Unsecured Notes, due 2021	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021 Period prior to April 1, 2016	Apr. 02, 2013 5.375% Senior Unsecured Notes, due 2021 Period on or prior to April 1, 2016	Jun. 28, 2013 6.125% Senior Unsecured Notes, due 2022	Sep. 30, 2013 6.125% Senior Unsecured Notes, due 2022	Oct. 31, 2012 6.125% Senior Unsecured Notes, due 2022	Sep. 30, 2013 4.875% Notes	Sep. 30, 2013 3.0% Notes	Oct. 31, 2013 3.0% Notes Subsequent Event	Oct. 12, 2013 9.25% Senior Secured Second Lien Notes due 2017	Sep. 30, 2013 9.25% Senior Secured Second Lien Notes due 2017	Dec. 31, 2013 9.25% Senior Secured Second Lien Notes due 2017 Forecast	Oct. 12, 2013 9.25% Senior Secured Second Lien Notes due 2017 Subsequent Event	Apr. 09, 2013 Revolving line of credit Bank Credit Agreement	Oct. 23, 2013 Revolving line of credit Subsequent Event Bank Credit Agreement	Oct. 31, 2013 Revolving line of credit Subsequent Event Bank Credit Agreement
Notes Payable And Commercial Bank Financing
Amount of debt issued			$ 450,000,000		$ 200,000,000	$ 445,000,000					$ 250,000,000			$ 350,000,000				$ 600,000,000
Variable rate basis				LIBOR			LIBOR	LIBOR				LIBOR																				LIBOR
Interest rate margin (as a percent)				2.25%			2.25%	2.25%				2.25%																				2.25%
LIBOR floor (as a percent)								0.75%				0.75%
Borrowing capacity				500,000,000	700,000,000			400,000,000			650,000,000														5,700,000		5,400,000					100,000,000
Gain (loss) on extinguishment of debt	16,283,000	335,000						16,300,000																			(900,000)			43,100,000
Deferred financing costs related to amendment			10,600,000					7,300,000	9,700,000	9,700,000
Interest expense									(2,400,000)	2,400,000
Increase in borrowing capacity																																	57,500,000	50,000,000
Debt instrument, stated interest rate payable (as a percent)													6.375%	6.375%			5.375%	5.375%	5.375%			6.125%	6.125%	6.125%	4.875%	3.00%	3.00%	9.25%	9.25%		9.25%
Percent of outstanding debt converted														1.00				1.00							1.00		1.00
Redemption price of the debt instrument (as a percent)															100.00%					100.00%
Maximum percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings																35.00%					35.00%
Purchase price in tender offers commenced as a percentage of face value																	100.00%					100.00%
Face amount of outstanding notes																	600,000,000					500,000,000
Class A Common Stock issued upon conversion (in shares)																									338,632
Face amount of debt redeemed																															500,000,000
Redemption price	998,085,000	95,845,000																													546,100,000
Conversion price	7,313,000																										10,500,000
Accrued and unpaid interest and make-whole premium																															25,400,000
Increase in additional paid-in capital																									$ 7,300,000