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Acquisition (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 01, 2020
Jan. 02, 2019
Business Acquisition [Line Items]          
Purchase of business $ 5,647 $ 48,581 $ 0    
Business combination, contingent consideration, liability 37,953 30,896      
Amortization of Intangible Assets 13,000 13,100 $ 5,000    
Quarton          
Business Acquisition [Line Items]          
Total estimated purchase price   103,000      
Purchase of business   75,300      
Business combination, contingent consideration, liability         $ 40,000
Other payments to acquire businesses   600      
Business combination, contingency liability, retention of employee, bonus pool, maximum   $ 10,000      
Business combination, contingency liability, retention of employee, bonus pool, period   5 years      
Business combination, contingency liability, retention of employee, bonus pool, annual maximum payout   $ 2,500      
Intangible assets         22,200
Amortization of Intangible Assets 8,900 8,900      
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed   $ 1,200      
MHT Partners [Member]          
Business Acquisition [Line Items]          
Total estimated purchase price 9,900        
Purchase of business 5,700        
Business combination, contingent consideration, liability       $ 4,200  
Intangible assets       $ 1,200  
Amortization of Intangible Assets 100        
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed $ 800        
Common Stock Class A | Quarton          
Business Acquisition [Line Items]          
Business acquisition, equity interest issued or issuable, number of shares   1,033,350      
Business acquisition, share price   $ 14.52      
Fair Value, Measurements, Recurring | Level 3 | Quarton          
Business Acquisition [Line Items]          
Business combination, contingent consideration, liability         27,700
Minimum | Quarton          
Business Acquisition [Line Items]          
Business combination, contingent consideration, liability         10,000
Maximum | Quarton          
Business Acquisition [Line Items]          
Business combination, contingent consideration, liability         $ 40,000