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Schedule of Changes in Restricted Stock - TIme Based Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Number of Shares    
Forfeited (4,128) 94.02
Restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The fair value of the time-based restricted shares is amortized ratably over the requisite service period, primarily three years. The time-based shares generally vest ratably on each anniversary following the grant date provided that a participant is continuously employed.  
Number of Shares    
Outstanding beginning of year, January 1, 472,132  
Granted 136,256  
Vested (66,253)  
Forfeited (5,800)  
Outstanding at period end, 536,335  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of year, January 1, $ 60.23  
Granted 50.94 $ 73.28
Vested 58.16  
Forfeited 68.18  
Outstanding at period end, $ 58.04  
Total intrinsic value of time based awards vested $ 3,530 $ 3,602
Total intrinsic value of time-based awards non-vested $ 26,297 $ 33,366
Market price per common share as of period end, $ 49.03 $ 62.35
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 20,600  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years