Long-Term Debt (Details) (USD $)	3 Months Ended			0 Months Ended		3 Months Ended		0 Months Ended								3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jan. 02, 2015 Credit Facility	Mar. 20, 2014 Credit Facility	Mar. 31, 2014 Credit Facility	Mar. 31, 2014 Credit Facility LIBO Rate Loans	Mar. 20, 2014 Credit Facility LIBO Rate Loans Minimum	Mar. 31, 2014 Credit Facility LIBO Rate Loans Minimum	Mar. 20, 2014 Credit Facility LIBO Rate Loans Maximum	Mar. 31, 2014 Credit Facility LIBO Rate Loans Maximum	Mar. 20, 2014 Credit Facility Alternate Base Rate Loans Minimum	Mar. 31, 2014 Credit Facility Alternate Base Rate Loans Minimum	Mar. 20, 2014 Credit Facility Alternate Base Rate Loans Maximum	Mar. 31, 2014 Credit Facility Alternate Base Rate Loans Maximum	Mar. 31, 2014 Credit Facility Prime rate	Mar. 31, 2014 Credit Facility Federal Funds rate	Mar. 31, 2014 Credit Facility One month LIBOR	Mar. 31, 2014 Senior Notes	Dec. 31, 2013 Senior Notes	Mar. 31, 2014 2020 Senior Notes, 6.75% interest, issued November 2010 and due November 2020	Dec. 31, 2013 2020 Senior Notes, 6.75% interest, issued November 2010 and due November 2020	Mar. 31, 2014 2021 Senior Notes, 6.5% interest, issued February and March 2011 and due August 2021	Dec. 31, 2013 2021 Senior Notes, 6.5% interest, issued February and March 2011 and due August 2021	Mar. 31, 2014 2022 Senior Notes, 6.25% interest, issued October 2011 and due June 2022	Dec. 31, 2013 2022 Senior Notes, 6.25% interest, issued October 2011 and due June 2022	Mar. 31, 2014 2023A Senior Notes, 5.5% interest, issued August 2012 and due February 2023	Dec. 31, 2013 2023A Senior Notes, 5.5% interest, issued August 2012 and due February 2023	Mar. 31, 2014 2023B Senior Notes, 4.5% interest, issued January 2013 and due July 2023	Dec. 31, 2013 2023B Senior Notes, 4.5% interest, issued January 2013 and due July 2023
Long-Term Debt
Long-term debt, net of discounts	$ 3,400,554,000		$ 3,023,071,000			$ 377,300,000															$ 500,000,000	$ 500,000,000	$ 324,541,000	$ 324,526,000	$ 455,000,000	$ 455,000,000	$ 743,713,000	$ 743,545,000	$ 1,000,000,000	$ 1,000,000,000
Debt instrument, stated interest rate percentage																					6.75%	6.75%	6.50%	6.50%	6.25%	6.25%	5.50%	5.50%	4.50%	4.50%
Long-term debt, discounts	6,746,000		6,929,000																				459,000	474,000			6,287,000	6,455,000
Applicable interest rate (as a percent)						4.50%
Estimate aggregate fair value of debt																			3,126,000,000	3,079,000,000
Credit facility current lending capacity					1,300,000,000
Term of debt instrument					18 months
Accordion option from increase borrowing capacity under the Credit Facility					250,000,000
Accordion option to increase borrowing capacity under the Credit Facility					500,000,000
Total Leverage Ratio					5.00
Basis of variable interest rate							LIBOR									Prime rate	Federal Funds Rate	One month LIBOR
Spread on variable rate basis (as a percent)								1.50%	1.125%	2.50%	2.00%	0.50%	0.125%	1.50%	1.00%		0.50%	1.00%
Letters of credit maximum borrowing capacity						150,000,000
Short-term swingline loan maximum borrowing capacity						10,000,000
Interest Coverage Ratio					2.50
Total leverage ratio before amendment				5.25	5.5
Deferred financing costs	1,890,000	14,046,000				1,900,000
Ownership of the Partnership in its guarantor subsidiaries (as a percent)	100.00%					100.00%
Borrowings outstanding						377,300,000
Letters of credit outstanding amount						11,300,000
Credit facility remaining borrowing capacity						911,400,000
Amount available for borrowing based on financial covenant requirements						$ 544,000,000