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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

X
- Definition The number of shares converted. + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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- Definition The repurchase of ordinary shares. + References No definition available. + Details
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- Definition The restricted shares issuesd to directors. + References No definition available. + Details
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- Definition The vested restricted shares. + References No definition available. + Details
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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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