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Stock-Based Compensation Restricted Stock (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Share-based compensation expense $ 2,100,000 $ 2,500,000 $ 5,800,000 $ 7,000,000  
Accrued employee compensation and benefits 14,824,000   14,824,000   22,435,000
Restricted Stock
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]          
Restricted stock, beginning of period     346,563    
Restricted stock, granted     86,330    
Restricted stock, cash settled     0    
Restricted stock, released     (99,825)    
Restricted stock, forfeited     (20,158)    
Restricted stock, end of period 312,910   312,910    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Weighted Average Grant Date Fair Value, Beginning balance     $ 44.74    
Weighted Average Grant Date Fair Value, Granted     $ 72.18    
Weighted Average Grant Date Fair Value, Cash Settled     $ 0.00    
Weighted Average Grant Date Fair Value, Released     $ 29.52    
Weighted Average Grant Date Fair Value, Forfeited     $ 52.13    
Weighted Average Grant Date Fair Value, Ending balance $ 56.63   $ 56.63    
Restricted Stock Units (RSUs)
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]          
Restricted stock, beginning of period     33,242    
Restricted stock, granted     14,878    
Restricted stock, cash settled     37,184    
Restricted stock, released     (39,000)    
Restricted stock, forfeited     0    
Restricted stock, end of period 46,304   46,304    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Weighted Average Grant Date Fair Value, Beginning balance     $ 41.19    
Weighted Average Grant Date Fair Value, Granted     $ 72.04    
Weighted Average Grant Date Fair Value, Cash Settled     $ 72.28    
Weighted Average Grant Date Fair Value, Released     $ 54.66    
Weighted Average Grant Date Fair Value, Forfeited     $ 0.00    
Weighted Average Grant Date Fair Value, Ending balance $ 64.57   $ 64.57    
Cash Settled Restricted Stock Units Classified as Liabilities
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]          
Restricted stock, beginning of period     37,184    
Restricted stock, cash settled     (37,184)    
Restricted stock, end of period 0   0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Weighted Average Grant Date Fair Value, Beginning balance     $ 66.13    
Weighted Average Grant Date Fair Value, Cash Settled     $ 72.28    
Weighted Average Grant Date Fair Value, Ending balance $ 0.00   $ 0.00    
LTIP
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Award vesting period     3 years    
Share-based compensation expense     (400,000) 200,000  
Accrued employee compensation and benefits 1,900,000   1,900,000   4,500,000
LTIP | Minimum
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Multiplier for target award based on total shareholder return on common stock     0.00%    
LTIP | Maximum
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Multiplier for target award based on total shareholder return on common stock     200.00%    
Board of Directors | Restricted Stock Units (RSUs)
         
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Share-based compensation expense     300,000 200,000  
Accrued employee compensation and benefits         $ 2,400,000