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
Mar. 31, 2016
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 104,967 $ 105,537
Noncurrent assets 1,299,086 1,293,925
Current liabilities 67,044 56,559
Noncurrent liabilities $ 151,246 $ 155,995