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Capital and Reserves - Treasury stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2021 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement [Line Items] |  |  |  |  |
Beginning balance (in shares) |  |  | 39,677,940 | 39,602,277 | 39,538,550
Beginning balance |  |  | $ 57,999 |  |
Ending balance (in shares) |  | 36,231,146 | 36,231,146 | 39,677,940 | 39,602,277
Ending balance |  | $ 115,799 | $ 115,799 | $ 57,999 |
Treasury stock |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Beginning balance (in shares) |  |  | 2,301,897 | 2,377,561 | 2,441,288
Beginning balance |  |  | $ 57,999 | $ 59,669 | $ 61,076
Repurchase of common stock (in shares) |  |  | 3,558,093 |  |
Repurchase of common stock |  |  | $ 60,079 |  |
Restricted stock issued - directors (in shares) |  |  | (63,000) | (63,000) | (57,000)
Restricted stock issued - directors |  |  | $ (1,391) | $ (1,391) | $ (1,259)
Restricted stock units - vested (in shares) |  |  | (48,299) | (12,664) | (6,727)
Restricted stock units - vested |  |  | $ (888) | $ (279) | $ (148)
Ending balance (in shares) |  | 5,748,691 | 5,748,691 | 2,301,897 | 2,377,561
Ending balance |  | $ 115,799 | $ 115,799 | $ 57,999 | $ 59,669
“Class A” | Treasury stock |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Beginning balance (in shares) |  |  | 318,140 | 318,140 | 318,140
Beginning balance |  |  | $ 10,708 | $ 10,708 | $ 10,708
Repurchase of common stock (in shares) |  |  | 0 |  |
Repurchase of common stock |  |  | $ 0 |  |
Restricted stock issued - directors (in shares) |  |  | 0 | 0 | 0
Restricted stock issued - directors |  |  | $ 0 | $ 0 | $ 0
Restricted stock units - vested (in shares) |  |  | 0 | 0 | 0
Restricted stock units - vested |  |  | $ 0 | $ 0 | $ 0
Ending balance (in shares) |  | 318,140 | 318,140 | 318,140 | 318,140
Ending balance |  | $ 10,708 | $ 10,708 | $ 10,708 | $ 10,708
“Class B” | Treasury stock |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Beginning balance (in shares) |  |  | 689,367 | 689,367 | 689,367
Beginning balance |  |  | $ 18,711 | $ 18,711 | $ 18,711
Repurchase of common stock (in shares) |  |  | 0 |  |
Repurchase of common stock |  |  | $ 0 |  |
Restricted stock issued - directors (in shares) |  |  | 0 | 0 | 0
Restricted stock issued - directors |  |  | $ 0 | $ 0 | $ 0
Restricted stock units - vested (in shares) |  |  | 0 | 0 | 0
Restricted stock units - vested |  |  | $ 0 | $ 0 | $ 0
Ending balance (in shares) |  | 689,367 | 689,367 | 689,367 | 689,367
Ending balance |  | $ 18,711 | $ 18,711 | $ 18,711 | $ 18,711
“Class E” | Treasury stock |  |  |  |  |
Statement [Line Items] |  |  |  |  |
Beginning balance (in shares) |  |  | 1,294,390 | 1,370,054 | 1,433,781
Beginning balance |  |  | $ 28,580 | $ 30,250 | $ 31,657
Repurchase of common stock (in shares) |  | 3,558,093 | 3,558,093 |  |
Repurchase of common stock | $ 60,000 |  | $ 60,079 |  |
Restricted stock issued - directors (in shares) |  |  | (63,000) | (63,000) | (57,000)
Restricted stock issued - directors |  |  | $ (1,391) | $ (1,391) | $ (1,259)
Restricted stock units - vested (in shares) |  |  | (48,299) | (12,664) | (6,727)
Restricted stock units - vested |  |  | $ (888) | $ (279) | $ (148)
Ending balance (in shares) |  | 4,741,184 | 4,741,184 | 1,294,390 | 1,370,054
Ending balance |  | $ 86,380 | $ 86,380 | $ 28,580 | $ 30,250

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