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Supplemental Financial Information (Summary of Other Long-term Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
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