Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Equity Investments Balance Sheet Disclosure) (Details)

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Equity Investments (Equity Investments Balance Sheet Disclosure) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 201,557 $ 148,733
Noncurrent assets 1,494,770 1,305,407
Current liabilities 130,178 57,173
Noncurrent liabilities $ 164,759 $ 67,680