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Schedule of Changes in Restricted Stock - TIme Based Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The SARs vest ratably over a three-year period and may be exercised at any point after vesting through ten years from the date of issuance. Pursuant to the terms of the awards, upon exercise, the executive officers will receive, in shares of common stock, the excess of the market price of the award on the date of exercise over the market price of the award on the date of issuance.  
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.  
Time based shares granted to executives 61,634  
Number of Shares    
Outstanding beginning of year, January 1, 525,081  
Granted 267,379  
Vested (233,269)  
Outstanding at June 30, 546,885  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of year, January 1, $ 50.23  
Granted 57.11 $ 48.54
Vested 49.74  
Outstanding at June 30, $ 53.69  
Total intrinsic value of time based awards vested $ 13,314 $ 10,126
Total intrinsic value of time-based awards non-vested $ 31,506 $ 34,556
Market price per common share as of June 30, $ 57.61 $ 53.64
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 21,700  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 1 month 5 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (12,306)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 55.27