Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Trade payables	$ 181,029	$ 166,296
Accrued salaries and wages	12,385	12,291
Accrued vacation liability	3,053	3,503
Current portion of liability for pension and post-retirement benefits	2,993	2,708
Accrued healthcare liability	4,078	2,702
Accrued property taxes and sales taxes	4,070	4,490
Vendor incentives	26,617	12,508
Other accrued liabilities	14,012	11,902
Accounts payable and accrued liabilities	248,237	$ 216,400
Decrease to trade payables due to reclassifications	$ 12,500