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Stock-Based Compensation (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Stock Options
item
Mar. 31, 2013
Restricted Stock, Restricted Stock Units, Cash Settled Restricted Stock Units and Cash Settled Performance Awards
item
Mar. 31, 2013
Cash settled restricted stock units and cash settled performance awards
Mar. 31, 2013
Restricted stock shares and stock settled restricted stock units
Mar. 31, 2013
Partnership Phantom Units
May 31, 2011
2007 Plan
Mar. 31, 2013
2007 Plan
Stock Options
Mar. 31, 2013
2007 Plan
Stock Appreciation Rights
Mar. 31, 2013
2007 Plan
Restricted Stock
Mar. 31, 2013
2007 Plan
Stock Settled Restricted Stock Units
Feb. 28, 2013
2013 Plan
Mar. 31, 2013
2013 Plan
Stock Options
Mar. 31, 2013
2013 Plan
Stock Appreciation Rights
Mar. 31, 2013
2013 Plan
Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value
Mar. 31, 2013
Employee Stock Purchase Plan
May 31, 2011
Employee Stock Purchase Plan
Mar. 31, 2013
Employee Stock Purchase Plan
Minimum
Mar. 31, 2013
Employee Stock Purchase Plan
Maximum
Mar. 31, 2013
Partnership Long-Term Incentive Plan
Stock-based compensation                                      
Maximum number of shares available under the Plan           12,500,000         6,500,000         1,000,000     1,035,378
Number of shares counted by each award             1 1 2 2   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) (236,000)                                    
Cancelled (in shares) (3,000)                                    
Options outstanding at the end of the period (in shares) 2,522,000                                    
Options exercisable at the end of the period (in shares) 1,812,000                                    
Weighted Average Exercise Price                                      
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) $ 16.72                                    
Cancelled (in dollars per share) $ 46.92                                    
Options outstanding at end of period, (in dollars per share) $ 27.82                                    
Options exercisable at the end of period (in dollars per share) $ 32.58                                    
Weighted Average Remaining Life                                      
Outstanding at the end of the period 4 years 1 month 6 days                                    
Exercisable at the end of the period 3 years 3 months 18 days                                    
Aggregate Intrinsic Value                                      
Outstanding at the end of the period (in dollars) $ 17,623,000                                    
Exercisable at the end of the period (in dollars) 9,573,000                                    
Total intrinsic value of stock options exercised (in dollars) 2,200,000                                    
Unrecognized compensation                                      
Expected unrecognized compensation cost related to unvested stock options (in dollars) 3,800,000 36,700,000     2,200,000                            
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 2 years 2 years 1 month 6 days     2 years 4 months 24 days                            
Shares                                      
Non-vested awards at the beginning of the period (in shares)   1,992,000 480,000 1,480,000 63,884,000                            
Granted (in shares)   693,000     55,334,000                            
Vested (in shares)   (720,000)     (18,135,000)                            
Cancelled (in shares)   (5,000)                                  
Non-vested awards at the end of the period (in shares)   1,960,000 480,000 1,480,000 101,083,000                            
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)   $ 25.06     $ 23.76                            
Vested (in dollars per share)   $ 18.79     $ 24.46                            
Cancelled (in dollars per share)   $ 20.13                                  
Non-vested awards at the end of the period (in dollars per share)   $ 18.29     $ 23.55                            
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                             288,318        
Employee Stock Purchase plan discount from market price (as a percent)                             5.00%