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Supplemental Financial Information (Summary of Other Long-term Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Balance Sheet Related Disclosures [Abstract] |  |
Income taxes payable on inter-company transfers of property | $ 109,971 | $ 124,551
Investments | 2,316 | 2,537
Loans and notes receivable | 1,964 | 2,029
Escrow deposit - Caisson | 1,000 | 0
Guaranteed deposits | 777 | 940
Other | 1,827 | 641
Other assets | $ 117,855 | $ 130,698

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