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Supplemental Financial Information (Summary of Prepaid Expenses and Other 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 $ 19,445 $ 19,445
Deposits and advances to suppliers 7,298 5,417
Earthquake grant receivable 4,983 4,748
Unbilled receivables (4,363) 0
Current loans and notes receivable 1,553 7,093
Escrow deposit - Caisson 2,000 0
Derivative contract assets 0 8,269
Other prepaid expenses 15,534 11,001
Prepaid Expense and Other Assets, Current $ 55,176 $ 55,973