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Supplemental Cash Flow Information - Additional Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]        
Interest paid $ (16,312) $ (9,279) $ (45,469) $ (24,011)
Income taxes paid (40,745) (38,445) (109,271) (91,000)
Income tax refunds $ 4,730 $ 1,207 $ 6,058 $ 3,570