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Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) (10-K) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Parent company net investment $ 633,275 $ 614,732 $ 631,197 $ 577,252 $ 558,767 $ 563,696 $ 551,747 $ 566,814
Deferred income tax liabilities 3,796   5,846     10,633    
Operating lease right-of-use assets 33,579   13,697     10,282    
Current operating lease liabilities 3,157   2,860     2,110    
Non-current operating lease liabilities $ 39,459   $ 14,641     $ 11,917    
Adoption of new accounting pronouncement                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Parent company net investment             900  
Adoption of new accounting pronouncement | Accounting Standards Update 2014-09                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Parent company net investment             900  
Deferred revenue             1,200  
Deferred income tax liabilities             300  
Adoption of new accounting pronouncement | Accounting Standards Update 2016-02                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Operating lease right-of-use assets             10,100  
Current operating lease liabilities             2,300  
Non-current operating lease liabilities             $ 11,500