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Stock-Based Compensation (Restricted Stock) (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Restricted stock, beginning of period (in shares) 346,563
Restricted stock, granted (in shares) 88,606
Restricted stock, cash settled (in shares) 0
Restricted stock, released (in shares) (112,625)
Restricted stock, forfeited (in shares) (53,551)
Restricted stock, end of period (in shares) 268,993
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 (per share) $ 44.74
Weighted Average Grant Date Fair Value, Granted (per share) $ 72.16
Weighted Average Grant Date Fair Value, Cash Settled (per share) $ 0.00
Weighted Average Grant Date Fair Value, Released (per share) $ 30.09
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 54.76
Weighted Average Grant Date Fair Value, Ending balance (per share) $ 57.84
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 (in shares) 33,242
Restricted stock, granted (in shares) 15,387
Restricted stock, cash settled (in shares) 37,184
Restricted stock, released (in shares) (39,000)
Restricted stock, forfeited (in shares) 0
Restricted stock, end of period (in shares) 46,813
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 (per share) $ 41.19
Weighted Average Grant Date Fair Value, Granted (per share) $ 72.04
Weighted Average Grant Date Fair Value, Cash Settled (per share) $ 72.28
Weighted Average Grant Date Fair Value, Released (per share) $ 54.66
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 0
Weighted Average Grant Date Fair Value, Ending balance (per share) $ 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 (in shares) 37,184
Restricted stock, cash settled (in shares) (37,184)
Restricted stock, end of period (in shares) 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 (per share) $ 66.13
Weighted Average Grant Date Fair Value, Cash Settled (per share) $ 72.28
Weighted Average Grant Date Fair Value, Ending balance (per share) $ 0.00