Commitments and Contingencies (Narratives) (Details) - Dec. 31, 2017 BRL in Millions	USD ($)	BRL
Foreign | Secretariat of the Federal Revenue Bureau of Brazil
Loss Contingencies [Line Items]
Value of tax credits disallowed	$ 1,000,000	BRL 3.4
Penalties, court costs, attorneys’ fees, and accrued interest	5,100,000	16.7
Tax liability related to the ICMS Tax Assessments, accrued	2,900,000	BRL 9.4
Inventory Purchase Commitments
Loss Contingencies [Line Items]
Non-cancelable purchase commitments	145,300,000
Software and Support Services Commitments
Loss Contingencies [Line Items]
Non-cancelable purchase commitments	$ 19,000,000