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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