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, 2015
Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 129,284 $ 181,060
Noncurrent assets 1,342,679 1,306,891
Current liabilities 72,347 114,506
Noncurrent liabilities $ 173,821 $ 230,062