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Capital and Reserves (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of share capital, reserves and other equity interest [Line Items]      
Authorized 280,000,000    
Beginning Balance (in Shares) 39,160,048 38,968,905 38,777,339
Conversions 0 0 0
Repurchase common stock (1,000)   0
Restricted stock issued - directors 57,000 57,000 57,000
Exercised stock options - compensation plans 142,268 68,785 70,358
Restricted stock units - vested 70,519 65,358 64,208
Ending Balance (in Shares) 39,428,835 39,160,048 38,968,905
Class A shares [Member]      
Disclosure of share capital, reserves and other equity interest [Line Items]      
Authorized 40,000,000    
Beginning Balance (in Shares) 6,342,189 6,342,189 6,342,189
Conversions 0 0 0
Repurchase common stock 0   0
Restricted stock issued - directors 0 0 0
Exercised stock options - compensation plans 0 0 0
Restricted stock units - vested 0 0 0
Ending Balance (in Shares) 6,342,189 6,342,189 6,342,189
Class B shares [Member]      
Disclosure of share capital, reserves and other equity interest [Line Items]      
Authorized 40,000,000    
Beginning Balance (in Shares) 2,474,469 2,474,469 2,479,050
Conversions (64,663) 0 (4,581)
Repurchase common stock (1,000)   0
Restricted stock issued - directors 0 0 0
Exercised stock options - compensation plans 0 0 0
Restricted stock units - vested 0 0 0
Ending Balance (in Shares) 2,408,806 2,474,469 2,474,469
Class E shares [Member]      
Disclosure of share capital, reserves and other equity interest [Line Items]      
Authorized 100,000,000    
Beginning Balance (in Shares) 30,343,390 30,152,247 29,956,100
Conversions 64,663 0 4,581
Repurchase common stock 0   0
Restricted stock issued - directors 57,000 57,000 57,000
Exercised stock options - compensation plans 142,268 68,785 70,358
Restricted stock units - vested 70,519 65,358 64,208
Ending Balance (in Shares) 30,677,840 30,343,390 30,152,247
Class F shares [Member]      
Disclosure of share capital, reserves and other equity interest [Line Items]      
Authorized 100,000,000    
Beginning Balance (in Shares) 0 0 0
Conversions 0 0 0
Repurchase common stock 0   0
Restricted stock issued - directors 0 0 0
Exercised stock options - compensation plans 0 0 0
Restricted stock units - vested 0 0 0
Ending Balance (in Shares) 0 0 0