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, 2015
Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]    
Interest paid including capitalized interest $ 43,195 $ 41,396