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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Other Changes in Certain Working Capital Accounts, Net    
Accounts receivable $ 4,031 $ 9,166
Other current assets (4,812) (3,508)
Accounts payable 4,539 4,251
Accrued employee compensation and benefits (22,399) (13,516)
Other accrued liabilities 335 1,412
Unearned revenue (3,339) (169)
Other, net (4,131) 106
Total $ (25,776) $ (2,258)