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v3.21.1

Capital and Reserves - Treasury stock (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance | $ 59,669 |  |
Beginning Balance (in Shares) | 39,602,277 | 39,538,550 | 39,428,834
Balance | $ 57,999 | $ 59,669 |
Ending Balance (in Shares) | 39,677,940 | 39,602,277 | 39,538,550
Treasury stock [member] |  |  |
Balance | $ 59,669 | $ 61,076 | $ 63,248
Beginning Balance (in Shares) | 2,377,561 | 2,441,288 | 2,551,004
Repurchase of common stock |  |  | $ 2,442
Repurchase of common stock (in Shares) |  |  | 99,257
Restricted stock issued - directors | $ (1,391) | $ (1,259) | $ (1,259)
Restricted stock issued - directors (in Shares) | (63,000) | (57,000) | (57,000)
Exercised stock options - compensation plans |  |  | $ (2,272)
Exercised stock options - compensation plans (in Shares) |  |  | (102,918)
Restricted stock units - vested | $ (279) | $ (148) | $ (1,083)
Restricted stock units - vested (in Shares) | (12,664) | (6,727) | (49,055)
Balance | $ 57,999 | $ 59,669 | $ 61,076
Ending Balance (in Shares) | 2,301,897 | 2,377,561 | 2,441,288
Class A shares [Member] | Treasury stock [member] |  |  |
Balance | $ 10,708 | $ 10,708 | $ 10,708
Beginning Balance (in Shares) | 318,140 | 318,140 | 318,140
Repurchase of common stock |  |  | $ 0
Repurchase of common stock (in Shares) |  |  | 0
Restricted stock issued - directors | $ 0 | $ 0 | $ 0
Restricted stock issued - directors (in Shares) | 0 | 0 | 0
Exercised stock options - compensation plans |  |  | $ 0
Exercised stock options - compensation plans (in Shares) |  |  | 0
Restricted stock units - vested | $ 0 | $ 0 | $ 0
Restricted stock units - vested (in Shares) | 0 | 0 | 0
Balance | $ 10,708 | $ 10,708 | $ 10,708
Ending Balance (in Shares) | 318,140 | 318,140 | 318,140
Class B shares [Member] | Treasury stock [member] |  |  |
Balance | $ 18,711 | $ 18,711 | $ 16,270
Beginning Balance (in Shares) | 689,367 | 689,367 | 590,174
Repurchase of common stock |  |  | $ 2,441
Repurchase of common stock (in Shares) |  |  | 99,193
Restricted stock issued - directors | $ 0 | $ 0 | $ 0
Restricted stock issued - directors (in Shares) | 0 | 0 | 0
Exercised stock options - compensation plans |  |  | $ 0
Exercised stock options - compensation plans (in Shares) |  |  | 0
Restricted stock units - vested | $ 0 | $ 0 | $ 0
Restricted stock units - vested (in Shares) | 0 | 0 | 0
Balance | $ 18,711 | $ 18,711 | $ 18,711
Ending Balance (in Shares) | 689,367 | 689,367 | 689,367
Class E shares [Member] | Treasury stock [member] |  |  |
Balance | $ 30,250 | $ 31,657 | $ 36,270
Beginning Balance (in Shares) | 1,370,054 | 1,433,781 | 1,642,690
Repurchase of common stock |  |  | $ 1
Repurchase of common stock (in Shares) |  |  | 64
Restricted stock issued - directors | $ (1,391) | $ (1,259) | $ (1,259)
Restricted stock issued - directors (in Shares) | (63,000) | (57,000) | (57,000)
Exercised stock options - compensation plans |  |  | $ (2,272)
Exercised stock options - compensation plans (in Shares) |  |  | (102,918)
Restricted stock units - vested | $ (279) | $ (148) | $ (1,083)
Restricted stock units - vested (in Shares) | (12,664) | (6,727) | (49,055)
Balance | $ 28,580 | $ 30,250 | $ 31,657
Ending Balance (in Shares) | 1,294,390 | 1,370,054 | 1,433,781

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