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Long-Term Debt (Details 2) (USD $)
 6 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jan. 31, 2013
4.75% convertible senior notes due January 2014
Mar. 31, 2013
4.75% convertible senior notes due January 2014
Dec. 31, 2012
4.75% convertible senior notes due January 2014
Mar. 31, 2013
Partnership's senior notes due 2021
Mar. 31, 2013
Partnership's senior notes due 2021
Jun. 30, 2013
Partnership's senior notes due 2021
Mar. 31, 2013
Partnership's senior notes due 2021
Prior to April 1, 2016
item
Mar. 31, 2013
Partnership's senior notes due 2021
Twelve month period beginning April 1, 2017
Mar. 31, 2013
Partnership's senior notes due 2021
Twelve month period beginning April 1, 2018
Mar. 31, 2013
Partnership's senior notes due 2021
Beginning April 1, 2019 and thereafter
Jun. 30, 2013
4.25% convertible senior notes due June 2014
Dec. 31, 2012
4.25% convertible senior notes due June 2014
Jun. 30, 2009
4.25% convertible senior notes due June 2014
Mar. 31, 2012
Revolving credit facility due July 2016
Mar. 31, 2012
Revolving credit facility due July 2016
Jun. 30, 2013
Revolving credit facility due July 2016
Mar. 31, 2013
Partnership's revolving credit facility and term loan facility
Mar. 31, 2013
Partnership's revolving credit facility and term loan facility
Mar. 31, 2012
Partnership's revolving credit facility and term loan facility
Mar. 31, 2013
Partnership's revolving credit facility
Mar. 31, 2012
Partnership's revolving credit facility
Jun. 30, 2013
Partnership's revolving credit facility
Mar. 31, 2013
Partnership's term loan facility
Long-term Debt                                                  
Repayment of long term debt $ 1,407,750,000 $ 1,158,104,000 $ 143,800,000                                            
Interest rate (as a percent)     4.75%   4.75%     6.00%         4.25% 4.25%                      
Redemption price as percentage of principal amount     100.00%           106.00% 103.00% 101.50% 100.00%                          
Increase (decrease) in borrowing capacity                               (200,000,000)           (100,000,000) 200,000,000    
Revolving credit facility borrowing capacity                               900,000,000 900,000,000         650,000,000 750,000,000    
Write-off of deferred financing costs       900,000                         1,300,000   700,000            
Decrease in applicable margin (as a percent)                                           0.25%     0.50%
Outstanding borrowings                                   246,000,000              
Outstanding letters of credit                                   156,700,000              
Initial conversion rate of debt instrument (Shares per USD)                         0.0431951                        
Initial conversion price per common stock shares (in dollars per share)                         $ 23.15                        
Undrawn capacity under revolving credit facility                                   497,300,000           430,000,000  
Available borrowings under revolving credit facility                                   497,300,000           430,000,000  
Maximum total debt to EBITDA ratio                                     5.25            
Maximum revised total debt to EBITDA ratio                                     5.5            
Revised total debt to EBITDA ratio, applicable period after acquisition                                     6 months            
Maximum senior secured debt to EBITDA ratio                                     4.0            
Principle amount of senior notes           350,000,000 350,000,000               355,000,000                    
Amount by which value of shares converted exceeds principle                         76,200,000                        
Proceeds from borrowings of long-term debt 1,474,037,000 1,179,000,000       336,900,000                                      
Amount of unamortized discount of notes           5,500,000 5,500,000 5,300,000         23,200,000 34,300,000                      
Effective interest rate (as a percent)               6.25%                                  
Transaction costs             $ 7,600,000                         $ 4,300,000 $ 500,000        
Maximum period in which the entity is required to register the Notes           365 days                                      
Maximum percentage of the aggregate principal amount of debt instruments that may be redeemed prior to 2016                 35.00%                                
Number of equity offerings                 1                                
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