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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 |

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