Revenues - Narrative (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]
Deferred revenue recognized	$ 1,100		$ 13,800
Deferred revenue recognized. billed prior period	200		700	$ 600
Contract With Customer, Asset, Revenue Recognized	100		500
Revenue from Contract with Customer, Excluding Assessed Tax	127,731	$ 135,895	370,392	$ 401,143
Operating Lease, Lease Income	90,100		269,900
Revenue, Remaining Performance Obligation, Amount	2,174,000		2,174,000
Shortfall Payments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract With Customer, Liability, Increase	400		400		$ 500
Deferred revenue shortfalls billed	400		400
Service, Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 37,700		$ 100,500