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SIGNIFICANT ACCOUNTING POLICIES - EPS (Details) | 12 Months Ended
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Dec. 31, 2017 item
Common Stock |
Earnings per share: |
Voting right per share (in votes per share) | 1
Class B Common Stock |
Earnings per share: |
Voting right per share (in votes per share) | 10

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- Definition Represents the per share voting rights of common stock. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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Period Type: |

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- Details
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