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Business Combinations - Southport Acquisition (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Period to realize additional earnings-based contingent consideration   12 months    
Adjustment to fair value of contingent consideration for purchase of business   $ 301 $ 1,816 $ 3,235
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Goodwill   335,564 $ 327,992 $ 305,238
Southport        
Business Acquisition [Line Items]        
Business Acquisition, Date of Acquisition Agreement Apr. 02, 2018      
Cash paid for acquisition $ 11,300      
Common stock issued 2,700      
Net working capital settlement 300      
Initial fair value estimate of additional earnings-based contingent consideration 4,300      
Acquisition maximum payout   6,600    
Current contingent consideration liability   5,200    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]        
Total purchase price $ 18,600      
Tax deductible amount of Goodwill   $ 12,300