Long-term Debt - CASHMAX Secured Borrowing Facility (Details) - Receivables Securitization Facility - CASHMAX secured borrowing facility - Variable Interest Entity, Primary Beneficiary $ in Millions	Dec. 31, 2018 USD ($)	Nov. 30, 2018 CAD ($)
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Maximum amount available from lender		$ 25,000,000
Amount outstanding at end of period	$ 1.2