Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Line Items]
Depreciation expense	$ 11,500	$ 12,700	$ 35,100	$ 34,000
Amortization expense on finance lease assets	926	$ 697	2,767	1,895
Property and equipment purchased through accounts payable and accrued liabilities, decreased amount			$ 6,300	$ 2,000
Capitalized Software
Property Plant And Equipment [Line Items]
Fixed asset impairment charges	$ 700