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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock Options
item
Dec. 31, 2011
Stock Options
Dec. 31, 2010
Stock Options
Dec. 31, 2012
Partnership Phantom Units
item
Dec. 31, 2012
Restricted Stock, Restricted Stock Units, Cash Settled Restricted Stock Units and Cash Settled Performance Awards
item
Dec. 31, 2012
Cash settled restricted stock units and cash settled performance awards
Dec. 31, 2012
Restricted stock shares and stock settled restricted stock 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, 2010
Restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units
May 31, 2011
Stock Incentive Plan
Dec. 31, 2012
Stock Incentive Plan
Stock Options
Dec. 31, 2012
Stock Incentive Plan
Stock Appreciation Rights
Dec. 31, 2012
Stock Incentive Plan
Restricted Stock
Dec. 31, 2012
Stock Incentive Plan
Restricted Stock Units
Dec. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2010
Employee Stock Purchase Plan
May 31, 2011
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Minimum
Dec. 31, 2012
Employee Stock Purchase Plan
Maximum
Dec. 31, 2012
Directors Stock and Deferral Plan
Aug. 20, 2007
Directors Stock and Deferral Plan
Dec. 31, 2012
Employment Inducement Plan
Nov. 30, 2011
Employment Inducement Plan
Stock-based compensation                                                        
Total stock-based compensation expense $ 19,249,000 $ 19,164,000 $ 23,351,000 $ 2,552,000 $ 3,916,000 $ 5,273,000         $ 16,583,000 $ 14,970,000 $ 17,796,000           $ 114,000 $ 278,000 $ 282,000              
Number of shares authorized and reserved for issuance             1,035,378             12,500,000               1,000,000       100,000   1,000,000
Number of shares counted by each award                             1 1 2 2                    
Expiration period       7 years                                                
Vesting of awards per anniversary or year (as a percent)       33.33%     33.33% 33.33%                                        
Number of anniversaries of grant date on which awards will vest       3     3 3                                        
Weighted average grant date fair value (in dollars per share)       $ 5.74 $ 5.81 $ 8.71                                            
Weighted average assumptions                                                        
Expected life       4 years 6 months 4 years 6 months 4 years 6 months                                            
Risk-free interest rate (as a percent)       0.78% 1.23% 2.13%                                            
Volatility (as a percent)       47.96% 45.17% 42.94%                                            
Dividend yield (as a percent)       0.00% 0.00% 0.00%                                            
Stock Options                                                        
Options outstanding at the beginning of the period (in shares)       3,271,000                                                
Granted (in shares)       153,000                                                
Exercised (in shares)       (34,000)                                                
Cancelled (in shares)       (806,000)                                                
Options outstanding at the end of the period (in shares)       2,584,000 3,271,000                                              
Options exercisable at the end of the period (in shares)       1,828,000                                                
Weighted Average Exercise Price                                                        
Options outstanding at the beginning of the period (in dollars per share)       $ 27.39                                                
Granted (in dollars per share)       $ 14.36                                                
Exercised (in dollars per share)       $ 16.41                                                
Cancelled (in dollars per share)       $ 26.55                                                
Options outstanding at end of period, (in dollars per share)       $ 27.02 $ 27.39                                              
Options exercisable at the end of period (in dollars per share)       $ 31.99                                                
Weighted Average Remaining Life                                                        
Outstanding at the end of the period       4 years 7 months 6 days                                                
Exercisable at the end of the period       3 years 7 months 6 days                                                
Aggregate Intrinsic Value                                                        
Outstanding at the end of the period       10,866,000                                                
Exercisable at the end of the period       5,425,000                                                
Total intrinsic value of stock options exercised       100,000 200,000 500,000                                            
Unrecognized compensation                                                        
Expected unrecognized compensation cost related to unvested stock options       2,600,000                                                
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized       1 year 7 months 6 days     1 year 8 months 12 days 1 year 8 months 12 days                                        
Shares                                                        
Non-vested awards at the beginning of the period (in shares)             75,267,000 1,670,000 545,000 1,447,000                                    
Granted (in shares)             29,717,000 1,221,000                                        
Vested (in shares)             (40,329,000) (772,000)                                        
Change in expected vesting of cash settled performance awards (in shares)               44,000                                        
Cancelled (in shares)             (771,000) (171,000)                                        
Non-vested awards at the end of the period (in shares)             63,884,000 1,992,000 545,000 1,447,000                                    
Weighted Average Grant-Date Fair Value Per Share                                                        
Non-vested awards at the beginning of the period (in dollars per share)             $ 21.45 $ 19.49                                        
Granted (in dollars per share)             $ 22.62 $ 14.33                                        
Vested (in dollars per share)             $ 18.73 $ 19.09                                        
Change in expected vesting of cash settled performance awards (in dollars per share)               $ 14.36                                        
Cancelled (in dollars per share)             $ 28.50 $ 22.39                                        
Non-vested awards at the end of the period (in dollars per share)             $ 23.62 $ 16.12                                        
Unrecognized compensation cost related to unvested restricted stock, restricted stock units, cash settled restricted stock units, cash settled performance awards and phantom units             1,000,000 22,600,000                                        
Amount for Employee stock purchase plan                                     $ 25,000                  
Percentage of Employee stock purchase plan                                     10.00%                  
Purchase price as a percent of the fair market value                                             85.00% 100.00%        
Remaining shares available for purchase                                     304,548           59,052   539,982  
Employee Stock Purchase plan discount from market price (as a percent)                                     5.00%