Revenues Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 7,400	$ 4,800	$ 11,000
Revenue from Contract with Customer, Including Assessed Tax	205,304	219,289	645,780	$ 644,488
Revenue, Remaining Performance Obligation, Amount	67,900		67,900
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with Customer, Asset, after Allowance for Credit Loss	13,400		13,400		$ 12,600
Contract Asset, Period Increase (Decrease)			800
Deferred revenues	31,768		31,768		$ 28,443
Increase (decrease) in deferred revenues			3,400
Deferred Revenue, Revenue Recognized	3,000		24,300
Change in Estimated Variable Consideration [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	1,700	1,100	6,500	1,400
Release of Allowance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with Customer, Performance Obligation Satisfied in Previous Period	$ 5,700	$ 3,700	$ 4,500	$ 2,600