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Long-Term Debt (Details 4) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Partnership's 6% senior notes due 2021
Dec. 31, 2013
Partnership's 6% senior notes due 2021
Jan. 31, 2014
Partnership's 6% senior notes due 2021
Subsequent events
Mar. 31, 2013
Partnership's 6% senior notes due 2021
Prior to April 1, 2016
offering
Mar. 31, 2013
Partnership's 6% senior notes due 2021
Twelve month period beginning April 1, 2017
Mar. 31, 2013
Partnership's 6% senior notes due 2021
Twelve month period beginning April 1, 2018
Mar. 31, 2013
Partnership's 6% senior notes due 2021
Beginning April 1, 2019 and thereafter
Long-Term Debt                    
Principle amount of senior notes       $ 350,000,000            
Interest rate (as a percent)         6.00% 6.00%        
Proceeds from borrowings of long-term debt 2,108,037,000 1,878,000,000 1,893,740,000 336,900,000            
Transaction costs         7,800,000          
Amount of unamortized discount of notes       5,500,000 5,000,000          
Effective interest rate (as a percent)         6.25%          
Interest expense related to amortization of debt discount         $ 400,000          
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed             35.00%      
Number of equity offerings             1      
Redemption price as percentage of principal amount             106.00% 103.00% 101.50% 100.00%
Minimum notes remaining outstanding if notes redeemed prior to 2016 (as a percent)             65.00%      
Maximum number of days within which the entity may redeem a percentage of the note following the date of the closing of equity offering             180 days