XML 92 R76.htm IDEA: XBRL DOCUMENT v3.8.0.1
INCOME TAX - Net Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Noncurrent deferred income tax asset $ 13,146 $ 15,789
Noncurrent deferred income tax liability (436,879) (676,472)
Noncurrent deferred income tax liability, net $ (423,733) $ (660,683)