Supplemental Disclosures of Cash Flows Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid (received) during the period:
Interest	$ 59,434	$ 55,286	$ 35,451
Income taxes	3,266	12,558	5,992
Non-cash investing and financing activities:
Capital assets purchased on account	14,769	16,864	12,083
Value of stock issued for Acquisition	$ 0	$ 0	$ 141,192

Future cash outflow to pay for purchases of fixed assets that have occurred.

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