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Stock-Based Compensation (Details 5) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Performance Share Awards
item
Dec. 31, 2011
Performance Share Awards
Dec. 31, 2010
Performance Share Awards
Dec. 31, 2012
Performance Share Awards
2010 Grants
item
Dec. 31, 2012
Performance Share Awards
Low end of range
Dec. 31, 2012
Performance Share Awards
High end of range
Dec. 31, 2012
Performance Share Awards
Equity Component.
Dec. 31, 2012
Performance shares based on performance conditions
item
Dec. 31, 2011
Performance shares based on performance conditions
Dec. 31, 2010
Performance shares based on performance conditions
Feb. 28, 2013
Performance shares based on performance conditions
2010 Grants
Dec. 31, 2012
Performance shares based on performance conditions
2010 Grants
Dec. 31, 2012
Performance shares based on performance conditions
2009 Grants
Dec. 31, 2011
Performance shares based on performance conditions
2008 Grants
Dec. 31, 2010
Performance shares based on performance conditions
2007 Grants
Dec. 31, 2012
Performance shares based on performance conditions
High end of range
Dec. 31, 2012
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
Dec. 31, 2010
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2009, 2008 and 2007
Dec. 31, 2009
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2009, 2008 and 2007
Dec. 31, 2008
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2009, 2008 and 2007
Dec. 31, 2007
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2009, 2008 and 2007
Dec. 31, 2011
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2010, 2009, and 2008 Grants
Dec. 31, 2010
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2010, 2009, and 2008 Grants
Dec. 31, 2009
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2010, 2009, and 2008 Grants
Dec. 31, 2008
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2010, 2009, and 2008 Grants
Dec. 31, 2012
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2011 2010 and 2009 Grants
Dec. 31, 2011
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2011 2010 and 2009 Grants
Dec. 31, 2010
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2011 2010 and 2009 Grants
Dec. 31, 2009
Performance Share Awards Based on Internal Performance Metrics -3 Year Graded Vesting
2011 2010 and 2009 Grants
Dec. 31, 2012
Performance Share Awards Based on Internal Metrics-Three Performance Metrics
item
Dec. 31, 2012
Performance shares based on market conditions
item
Dec. 31, 2011
Performance shares based on market conditions
Dec. 31, 2010
Performance shares based on market conditions
Dec. 31, 2012
Performance shares based on market conditions
2010 Grants
Dec. 31, 2012
Performance shares based on market conditions
2009 Grants
Dec. 31, 2012
Performance shares based on market conditions
2010 and 2009 Grants
Dec. 31, 2011
Performance shares based on market conditions
2008 Grants
Dec. 31, 2010
Performance shares based on market conditions
2007 Grants
Dec. 31, 2012
Performance shares based on market conditions
High end of range
Dec. 31, 2012
Performance shares based on market conditions
Equity Component.
Dec. 31, 2011
Performance shares based on market conditions
Equity Component.
Dec. 31, 2010
Performance shares based on market conditions
Equity Component.
Dec. 31, 2012
Performance shares based on market conditions
Liability Component
Dec. 31, 2011
Performance shares based on market conditions
Liability Component
Dec. 31, 2010
Performance shares based on market conditions
Liability Component
Dec. 31, 2012
Performance shares based on market conditions
Liability Component
Low end of range
Dec. 31, 2011
Performance shares based on market conditions
Liability Component
Low end of range
Dec. 31, 2010
Performance shares based on market conditions
Liability Component
Low end of range
Dec. 31, 2012
Performance shares based on market conditions
Liability Component
High end of range
Dec. 31, 2011
Performance shares based on market conditions
Liability Component
High end of range
Dec. 31, 2010
Performance shares based on market conditions
Liability Component
High end of range
Stock-Based Compensation arrangements                                                                                                            
Number of types of performance awards granted to employees       3             2                                             1                                        
Annual forfeiture rate assumption (as a percent)               0.00% 7.00%                                                                                          
Shares or units                                                                                                            
Outstanding at the beginning of the period (in shares)       2,441,566                                                                                                    
Granted (in shares)       518,602 789,514 694,340         401,141 604,122 525,400             117,461                         283,380 117,461 185,392 168,940                                    
Issued and Fully Vested (in shares)       (1,358,564) (620,140) (820,538)                   (594,960) (287,600) (300,200)     (335,538)       (187,516)       (201,044)               (168,940) (393,620)   (471,744) (184,800)                          
Forfeited (in shares)       (42,850) (65,700) (80,360)                                                                                                
Outstanding at the end of the period (in shares)       1,558,754 2,441,566                                                                                                  
Weighted-Average Grant Date Fair Value per Share                                                                                                            
Outstanding at the beginning of the period (in dollars per share)       $ 15.31                                                                                                    
Granted (in dollars per share)       $ 33.62 $ 19.25 $ 19.24         $ 35.18                                     $ 20.37 $ 20.27 $ 11.32                                            
Issued and Fully Vested (in dollars per share)       $ 11.95                                                                                                    
Forfeited (in dollars per share)       $ 24.22                                                                                                    
Outstanding at the end of the period (in dollars per share)       $ 24.08 $ 15.31                                                                                                  
Additional disclosure                                                                                                            
Weighted-Average Remaining Contractual Term of non-vested shares       1 year 1 month 6 days                                                                                                    
Aggregate Intrinsic Value       $ 77,532,000                                                                                                    
Performance achieved                                                                                                            
Certified achievement, value of award                           6,200,000   6,700,000 5,900,000 5,300,000     5,100,000       3,900,000       3,300,000               2,700,000 3,500,000   2,700,000 2,800,000                          
Additional information related to stock-based compensation                                                                                                            
Weighted-average grant date fair value of shares vested (in dollars per share)                                           $ 11.32 $ 24.24 $ 17.61   $ 20.27 $ 11.32 $ 24.24   $ 20.37   $ 11.32                                            
Performance share cash award in addition to shares                                                                         8,300,000   18,400,000   1,300,000                          
Unamortized compensation expense                   12,700,000                                                                                        
Unrecognized compensation expense recognition period                   1 year 10 months 24 days                                                                                        
Total compensation cost recognized 33,500,000 39,500,000 14,400,000 24,600,000 28,500,000 12,400,000                                                                                                
Right to receive shares as percentage of award                           100.00%         100.00%                                             100.00%                        
Minimum operating cash flow for the year preceding the performance period                                       100,000,000                                                                    
Vesting rights                                                                 An employee will earn one-third of the award granted for each internal performance metric that the Company meets at the end of the performance period.                                          
Number of criteria considered for awarding performance shares                                                                 3                                          
Number of years over which performance criteria is to be met                                                                   3 years                                        
Number of other companies in the Company's peer group                                                                   16                                        
Right to receive shares (as a percent) 100.00%                                                                                                          
Assumptions:                                                                                                            
Fair Value Per Performance Share Award at the End of the Period                                                                                     $ 28.31 $ 15.62 $ 6.50       $ 38.22 $ 25.64 $ 0.00 $ 49.52 $ 35.47 $ 3.08
Stock price volatility (as a percent)                                                                                     46.70% 62.00% 61.80%                  
Stock Price Volatility, low end of range (as a percent)                                                                                           41.10% 41.90% 70.70%            
Stock Price Volatility, high end of range (as a percent)                                                                                           45.70% 42.70% 71.70%            
Risk free rate of return (as a percent)                                                                                     0.40% 1.30% 1.40%                  
Risk free rate of return, low end of range (as a percent)                                                                                           0.20% 0.10% 0.30%            
Risk free rate of return, high end of range (as a percent)                                                                                           0.30% 0.30% 0.40%            
Expected dividend yield (as a percent)                                                                                     0.20% 0.20% 0.30% 0.20% 0.20% 0.40%            
General information on stock-based compensation                                                                                                            
Long-term liability, included in Other Liabilities                                                                                           7,600,000 5,600,000              
Short-term liability, included in Other Liabilities                                                                                           $ 0 $ 10,100,000              
Number of types of performance shares awards for which performance goal period ended             2                                                                                              
Certified achievement, shares issuable                           305,480                                                                                
Percentage of value of awards receivable in cash                                                                                   100.00%                        
Number of performance shares eligible for awards                             305,480