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
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]    
Interest paid including capitalized interest $ 13,382 $ 11,580