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Acquisitions and Dispositions (Details Textual) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Apr. 26, 2021
Jul. 01, 2020
Mar. 19, 2020
Feb. 14, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]              
Aggregate purchase price for noncontrolling interest         $ 20,269 $ 11,050  
Deferred acquisition consideration         67,668   $ 83,065
Redeemable noncontrolling interest, redemptions, value         0   $ 12,289
Veritas [Member]              
Business Acquisition [Line Items]              
Remaining ownership interest acquired   10.00%          
Aggregate purchase price for noncontrolling interest   $ 2,187          
Deferred cash payment for noncontrolling interest   1,087          
Reduction of noncontrolling and redeemable noncontrolling interest   2,651          
Difference between purchase price and noncontrolling interest recorded in common stock and other paid-in capital   $ 464          
Gale              
Business Acquisition [Line Items]              
Remaining ownership interest acquired (percent) 40.00%            
Aggregate purchase price $ 20,000            
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination 11,406            
Reduction in noncontrolling interests $ 10,339            
KWT Global [Member]              
Business Acquisition [Line Items]              
Remaining ownership interest acquired (percent)     22.50%        
Aggregate purchase price     $ 2,118        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     7,695        
Closing cash payment     729        
Deferred acquisition consideration     1,389        
Redeemable noncontrolling interest, redemptions, value         $ (1,615)    
Reduction in noncontrolling interests     $ 503        
Sloane and Company LLC [Member]              
Business Acquisition [Line Items]              
Proceeds from Divestiture of Businesses       $ 26,696      
Gain (loss) on disposition of business       $ 16,827      
Sloane and Company LLC [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]              
Business Acquisition [Line Items]              
Period of contingent payments expected after disposal       2 years