Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 148,733 $ 105,537
Noncurrent assets 1,305,407 1,293,925
Current liabilities 57,173 56,559
Noncurrent liabilities $ 67,680 $ 155,995