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Schedule of Changes in Restricted Stock - Market Based Awards (Details) - Restricted Stock - Market Based Awards - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award    
Vested and expected to vest at September 30, $ 0 $ 1,174
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The fair value of the market-based restricted shares is amortized ratably over the requisite service period, primarily three years. The market-based shares vest if the participant is continuously employed throughout the performance period and the market-based performance measure is achieved, with a maximum vesting period of three years. All compensation cost related to the market-based awards will be recognized if the requisite service period is fulfilled, even if the market condition is not achieved.  
Time based shares granted to executives 28,069  
Number of Shares    
Outstanding beginning of year, January 1, 48,420  
Granted 28,069  
Outstanding at September 30, 76,489  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of year, January 1, $ 64.97  
Granted 94.02 $ 72.54
Outstanding at June 30, $ 75.63  
Total intrinsic value of market-based awards non-vested $ 3,750 $ 5,670
Market price per common share as of June 30, $ 49.03 $ 67.06
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 2,900  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months 25 days