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Schedule of Changes in Restricted Stock - TIme Based Awards (Details) - Restricted stock - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
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, 479,642  
Granted 260,019  
Vested (206,242)  
Forfeited (7,990)  
Outstanding at September 30, 525,429  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of year, January 1, $ 56.09  
Granted 66.00 $ 57.12
Vested 56.44  
Forfeited 64.32  
Outstanding at June 30, $ 60.73  
Total intrinsic value of time based awards vested $ 13,266 $ 14,675
Total intrinsic value of time-based awards non-vested $ 25,762 $ 35,079
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 $ 22,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months 25 days