Annual report pursuant to Section 13 and 15(d)

Equity Investments - Equity Investments Balance Sheet Disclosure (Details)

v3.8.0.1
Equity Investments - Equity Investments Balance Sheet Disclosure (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 415,032 $ 148,733
Noncurrent assets 1,542,090 1,305,407
Current liabilities 261,086 57,173
Noncurrent liabilities $ 148,839 $ 67,680