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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Amounts owed to employees participating in the Deferred Compensation Plan $ 3,200   $ 3,600
Payment for contingent consideration associated with Brink Earn Out 2,550 $ 0 3,000
Obligations      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance at beginning of period 2,550    
New level 3 liability 0    
Total gains (losses) reported in earnings 0    
Settlement of Level 3 liabilities (2,550)    
Balance at end of period $ 0   $ 2,550