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Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Ownership interest in subsidiaries | 100.00% |
Assets of TRSs | $ 40,150 | $ 26,676
Liabilities of TRSs | $ 139,276 | $ 101,602

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