Quarterly report pursuant to Section 13 or 15(d)

Supplemental Cash Flow Information (Details)

v3.10.0.1
Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash paid during the period for:    
Income taxes $ 16,121 $ 21,005
Interest(1) 79,333 118,793
Non-cash investing activity:    
Capital expenditures acquired on account but unpaid as of the period end $ 10,624 $ 12,924