Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Income Taxes [Line Items]
Income tax expense (benefit), Total	$ 4,484	$ 685
Income tax benefit, percent of pretax loss	20.80%	1.20%
Income Tax Expense (Benefit), Other Discrete Tax Benefits	$ 1,000
Minimum
Schedule of Income Taxes [Line Items]
Statutory tax rate, Canada, Australia and the U.S.	21.00%
Maximum
Schedule of Income Taxes [Line Items]
Statutory tax rate, Canada, Australia and the U.S.	30.00%