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Nonvested Common Stock Awards Activity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Underlying Shares - Outstanding at beginning of year 153 76 33
Underlying Shares - Granted 1 108 59
Underlying Shares - Exercised (8) (31) (16)
Underlying Shares - Canceled or forfeited (29) 0 0
Underlying Shares - Outstanding at end of year 117 153 76
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 Exercise Price - Outstanding at beginning of year $ 39.24 $ 30.74 $ 28.50
Weighted-Average Exercise Price - Granted $ 51.70 $ 43.45 $ 31.59
Weighted-Average Exercise Price - Vested $ 32.97 $ 33.04 $ 29.26
Weighted-Average Exercise Price - Canceled or forfeited $ 39.49 $ 0.00 $ 0.00
Weighted-Average Exercise Price - Outstanding at end of year $ 39.91 $ 39.24 $ 30.74