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Stock Compensation - Long-Term Incentive Plan Awards (Details) - 2019 LTIP PSUs - 2015 SIP - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 3 years      
Award requisite service period 36 months      
Granted (in shares)     41,793  
Granted (in dollars per share)     $ 120.24  
Compensation expenses   $ 454   $ 513
Unrecognized Stock Compensation Expense   $ 4,512   $ 4,512
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights percentage 200.00%      
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Financial performance achievement percentage 90.00%