Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Cash Flows Supplemental Disclosures (Net Cash Paid or Received) (Details)

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Consolidated Statements of Cash Flows Supplemental Disclosures (Net Cash Paid or Received) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Net cash paid or received:    
Interest paid including capitalized interest $ 56,250 $ 50,789