Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Schedule of Other Liabilities (Long-term) (Details)

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Significant Accounting Policies - Schedule of Other Liabilities (Long-term) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Apache lawsuit $ 49,500  
Uncertain tax positions including interest/penalties 11,015 $ 10,584
Other 6,351 6,521
Total other liabilities (long-term) $ 66,866 $ 17,105