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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Changes in Certain Working Capital Accounts, Net    
Accounts receivable $ 9,166 $ (1,018)
Other current assets (3,508) (24)
Accounts payable 4,251 2,283
Accrued employee compensation and benefits (13,516) (12,741)
Other accrued liabilities 1,412 886
Other, net (63) (862)
Total $ (2,258) $ (11,476)