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Shareholders' Equity - Noncontrolling Interests (Details) - SACS | 12 Months Ended
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Dec. 31, 2017
Noncontrolling Interest [Line Items] |
Life term of contract | 25 years
Percentage of profit share of parent in joint venture | 88.75%
Percentage of profit share of noncontrolling in joint venture | 11.25%

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- Details
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