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Capital and Reserves (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Balance | $ 1,011,314 | $ 971,931 | $ 911,039
Beginning Balance (in Shares) | 39,160,048 | 38,968,905 | 38,777,339
Repurchase of common stock | $ (28) | $ 0 | $ 0
Restricted stock issued - directors | 30 | 0 | 0
Balance | $ 1,042,812 | $ 1,011,314 | $ 971,931
Ending Balance (in Shares) | 39,428,835 | 39,160,048 | 38,968,905
Treasury stock [member] |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Balance | $ (69,176) | $ (73,397) | $ (77,627)
Beginning Balance (in Shares) | 2,819,791 | 3,010,934 | 3,202,500
Repurchase of common stock | $ (28) | $ 0 | $ 0
Repurchase of common stock (in Shares) | 1,000 | 0 | 0
Restricted stock issued - directors | $ 1,259 | $ 1,259 | $ 1,259
Restricted stock issued - directors (in Shares) | (57,000) | (57,000) | (57,000)
Exercised stock options - compensation plans | $ (3,140) | $ (1,519) | $ (1,553)
Exercised stock options - compensation plans (in Shares) | (142,268) | (68,785) | (70,358)
Restricted stock units - vested | $ (1,557) | $ (1,443) | $ (1,418)
Restricted stock units - vested (in Shares) | (70,519) | (65,358) | (64,208)
Balance | $ (63,248) | $ (69,176) | $ (73,397)
Ending Balance (in Shares) | 2,551,004 | 2,819,791 | 3,010,934
Class A shares [Member] | Treasury stock [member] |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Balance | $ 10,708 | $ 10,708 | $ 10,708
Beginning Balance (in Shares) | 318,140 | 318,140 | 318,140
Repurchase of common stock | $ 0 | $ 0 | $ 0
Repurchase of common stock (in Shares) | 0 | 0 | 0
Restricted stock issued - directors | $ 0 | $ 0 | $ 0
Restricted stock issued - directors (in Shares) | 0 | 0 | 0
Exercised stock options - compensation plans | $ 0 | $ 0 | $ 0
Exercised stock options - compensation plans (in Shares) | 0 | 0 | 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] |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Balance | $ 16,242 | $ 16,242 | $ 16,242
Beginning Balance (in Shares) | 589,174 | 589,174 | 589,174
Repurchase of common stock | $ 28 | $ 0 | $ 0
Repurchase of common stock (in Shares) | 1,000 | 0 | 0
Restricted stock issued - directors | $ 0 | $ 0 | $ 0
Restricted stock issued - directors (in Shares) | 0 | 0 | 0
Exercised stock options - compensation plans | $ 0 | $ 0 | $ 0
Exercised stock options - compensation plans (in Shares) | 0 | 0 | 0
Restricted stock units - vested | $ 0 | $ 0 | $ 0
Restricted stock units - vested (in Shares) | 0 | 0 | 0
Balance | $ 16,270 | $ 16,242 | $ 16,242
Ending Balance (in Shares) | 590,174 | 589,174 | 589,174
Class E shares [Member] | Treasury stock [member] |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Balance | $ 42,226 | $ 46,447 | $ 50,677
Beginning Balance (in Shares) | 1,912,477 | 2,103,620 | 2,295,186
Repurchase of common stock | $ 0 | $ 0 | $ 0
Repurchase of common stock (in Shares) | 0 | 0 | 0
Restricted stock issued - directors | $ (1,259) | $ (1,259) | $ (1,259)
Restricted stock issued - directors (in Shares) | (57,000) | (57,000) | (57,000)
Exercised stock options - compensation plans | $ (3,140) | $ (1,519) | $ (1,553)
Exercised stock options - compensation plans (in Shares) | (142,268) | (68,785) | (70,358)
Restricted stock units - vested | $ (1,557) | $ (1,443) | $ (1,418)
Restricted stock units - vested (in Shares) | (70,519) | (65,358) | (64,208)
Balance | $ 36,270 | $ 42,226 | $ 46,447
Ending Balance (in Shares) | 1,642,690 | 1,912,477 | 2,103,620

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