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Stock-Based Compensation (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Stock Options
anniversary
Sep. 30, 2013
Restricted Stock, Restricted Stock Units, Cash Settled Restricted Stock Units and Cash Settled Performance Awards
anniversary
Sep. 30, 2013
Cash settled restricted stock units and cash settled performance awards
Sep. 30, 2013
Restricted stock shares and restricted stock units
Sep. 30, 2013
Partnership Phantom Units
Apr. 30, 2013
2013 Plan
Sep. 30, 2013
2013 Plan
Stock Options
Sep. 30, 2013
2013 Plan
Stock Appreciation Rights
Sep. 30, 2013
2013 Plan
Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value
Sep. 30, 2013
Employee Stock Purchase Plan
May 31, 2011
Employee Stock Purchase Plan
Sep. 30, 2013
Employee Stock Purchase Plan
Minimum
Sep. 30, 2013
Employee Stock Purchase Plan
Maximum
Sep. 30, 2013
Partnership Long-Term Incentive Plan
Stock-based compensation                            
Maximum number of shares available under the Plan           6,500,000         1,000,000     1,035,378
Number of shares counted by each award             1 1 1.75          
Expiration period 7 years                          
Vesting of awards per anniversary or year (as a percent) 33.33% 33.33%                        
Number of anniversaries of grant date on which awards will vest 3 3                        
Weighted average grant date fair value (in dollars per share) $ 10.19                          
Weighted average assumptions                            
Expected life 4 years 6 months                          
Risk-free interest rate (as a percent) 0.66%                          
Volatility (as a percent) 49.19%                          
Dividend yield (as a percent) 0.00%                          
Stock Options                            
Options outstanding at the beginning of the period (in shares) 2,584,000                          
Granted (in shares) 177,000                          
Exercised (in shares) (321,000)                          
Cancelled (in shares) (138,000)                          
Options outstanding at the end of the period (in shares) 2,302,000                          
Options exercisable at the end of the period (in shares) 1,663,000                          
Weighted Average Exercise Price Per Share                            
Options outstanding at the beginning of the period (in dollars per share) $ 27.02                          
Granted (in dollars per share) $ 25.04                          
Exercised (in dollars per share) $ 17.60                          
Cancelled (in dollars per share) $ 31.23                          
Options outstanding at end of period, (in dollars per share) $ 27.93                          
Options exercisable at the end of period (in dollars per share) $ 32.84                          
Weighted Average Remaining Life                            
Outstanding at the end of the period 3 years 7 months 6 days                          
Exercisable at the end of the period 2 years 10 months 24 days                          
Aggregate Intrinsic Value                            
Outstanding at the end of the period (in dollars) $ 17,490,000                          
Exercisable at the end of the period (in dollars) 9,555,000                          
Total intrinsic value of stock options exercised (in dollars) 3,000,000                          
Unrecognized compensation                            
Expected unrecognized compensation cost related to unvested stock options (in dollars) 2,500,000 26,000,000     1,600,000                  
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 1 year 6 months 1 year 8 months 12 days     1 year 10 months 24 days                  
Shares                            
Non-vested awards at the beginning of the period (in shares)   1,992,000 404,000 1,370,000 64,000                  
Granted (in shares)   702,000     55,000                  
Vested (in shares)   (822,000)     (20,000)                  
Cancelled (in shares)   (98,000)     (5,000)                  
Non-vested awards at the end of the period (in shares)   1,774,000 404,000 1,370,000 94,000                  
Weighted Average Grant-Date Fair Value Per Share                            
Non-vested awards at the beginning of the period (in dollars per share)   $ 16.12     $ 23.62                  
Granted (in dollars per share)   $ 25.10     $ 23.76                  
Vested (in dollars per share)   $ 18.43     $ 24.28                  
Cancelled (in dollars per share)   $ 19.29     $ 24.31                  
Non-vested awards at the end of the period (in dollars per share)   $ 18.43     $ 25.52                  
Employee Stock Purchase Plan                            
Maximum employee salary to purchase shares (in dollars)                   $ 25,000        
Maximum percentage of employee eligible pay to purchase shares                   10.00%        
Purchase price as a percent of the fair market value                       85.00% 100.00%  
Remaining shares available for purchase                   254,295        
Employee Stock Purchase plan discount from market price (as a percent)                   5.00%