Intangible Assets, Other Than Goodwill (Details) - USD ($) $ in Thousands |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Goodwill and Intangible Assets Disclosure [Abstract] | ||
| Acquisition cost | $ 178,642 | $ 178,642 |
| Accumulated amortization | (82,859) | (80,079) |
| Total Intangible assets net book value | $ 95,783 | $ 98,563 |