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Stock-Based Compensation and Awards (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2011
Stock Options
Dec. 31, 2013
Stock Options
Maximum
Dec. 31, 2013
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units
Dec. 31, 2012
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units
Dec. 31, 2011
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units
Dec. 31, 2013
Restricted Stock, Restricted Stock Units, Cash Settled Restricted Stock Units and Cash Settled Performance Awards
Dec. 31, 2013
Cash settled restricted stock units and cash settled performance awards
Dec. 31, 2013
Restricted stock shares and restricted stock units
Dec. 31, 2013
Partnership Phantom Units
Apr. 30, 2013
2013 Plan
Dec. 31, 2013
2013 Plan
Stock Options
Dec. 31, 2013
2013 Plan
Stock Appreciation Rights
Dec. 31, 2013
2013 Plan
Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value
Dec. 31, 2013
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
May 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2013
Employee Stock Purchase Plan
Minimum
Dec. 31, 2013
Employee Stock Purchase Plan
Maximum
Dec. 31, 2013
Directors Stock and Deferral Plan
Aug. 20, 2007
Directors Stock and Deferral Plan
Dec. 31, 2013
Partnership Long-Term Incentive Plan
Stock-based compensation                                                      
Total stock-based compensation expense (in dollars) $ 22,901,000 $ 19,249,000 $ 19,164,000 $ 2,241,000 $ 2,552,000 $ 3,916,000   $ 20,518,000 $ 16,583,000 $ 14,970,000                 $ 142,000 $ 114,000 $ 278,000            
Maximum number of shares available under the Plan                             6,500,000             1,000,000       100,000 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%     33.33%                          
Weighted average grant date fair value (in dollars per share)       $ 10.19 $ 5.74 $ 5.81                                          
Weighted average assumptions                                                      
Expected life       4 years 6 months 4 years 6 months 4 years 6 months                                          
Risk-free interest rate (as a percent)       0.66% 0.78% 1.23%                                          
Volatility (as a percent)       49.19% 47.96% 45.17%                                          
Dividend yield (as a percent)       0.00% 0.00% 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)       (459,000)                                              
Cancelled (in shares)       (150,000)                                              
Options outstanding at the end of the period (in shares)       2,152,000 2,584,000                                            
Options exercisable at the end of the period (in shares)       1,696,000                                              
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)       $ 18.12                                              
Cancelled (in dollars per share)       $ 33.94                                              
Options outstanding at end of period, (in dollars per share)       $ 28.27 $ 27.02                                            
Options exercisable at the end of period (in dollars per share)       $ 31.27                                              
Weighted Average Remaining Life                                                      
Outstanding at the end of the period       3 years 4 months 24 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)       26,522,000                                              
Exercisable at the end of the period (in dollars)       18,742,000                                              
Total intrinsic value of stock options exercised (in dollars)       4,400,000 100,000 200,000                                          
Unrecognized compensation                                                      
Expected unrecognized compensation cost related to unvested stock options (in dollars)       2,000,000             23,400,000     1,300,000                          
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized       1 year 3 months 18 days             1 year 6 months     1 year 8 months 12 days                          
Shares                                                      
Non-vested awards at the beginning of the period (in shares)                     1,992,000 419,000 1,253,000 64,000                          
Granted (in shares)                     702,000     55,334                          
Vested (in shares)                     (924,000)     (28,000)                          
Change in expected vesting of cash settled performance awards (in shares)                     20,000                                
Cancelled (in shares)                     (118,000)     (6,000)                          
Non-vested awards at the end of the period (in shares)                     1,672,000 419,000 1,253,000 85,000                          
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)                     $ 17.56     $ 23.45                          
Change in expected vesting of cash settled performance awards (in dollars per share)                     $ 25.04                                
Cancelled (in dollars per share)                     $ 19.33     $ 24.31                          
Non-vested awards at the end of the period (in dollars per share)                     $ 18.97     $ 23.72                          
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                                     238,281           56,858    
Employee Stock Purchase plan discount from market price (as a percent)                                     5.00%