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Schedule of Changes in Restricted Stock - Market Based Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 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 - Market Based Awards    
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 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 24,280  
Number of Shares    
Outstanding beginning of year, January 1, 71,549  
Granted 24,280  
Outstanding at March 31, 95,829  
Weighted-Average Grant-Date Fair Value    
Outstanding at beginning of year, January 1, $ 63.60  
Granted 72.54 $ 57.35
Outstanding at March 31, $ 65.86  
Total intrinsic value of market-based awards non-vested $ 5,697 $ 6,113
Market price per common share as of March 31, $ 59.45 $ 54.04
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 3,000  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years