Revenues - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue recognized	$ 5,100			$ 12,600
Document Period End Date				Jun. 30, 2020
Deferred revenue recognized. billed prior period				$ 700	$ 600
Contract With Customer, Asset, Revenue Recognized	200			400
Revenue from Contract with Customer, Excluding Assessed Tax	114,807		$ 130,751	242,661	265,248
Operating Lease, Lease Income	86,300			179,500
Revenue, Remaining Performance Obligation, Amount	2,269,000			2,269,000
Shortfall Payments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract With Customer, Liability, Increase		$ 500	$ 0	300	$ 700
Deferred revenue shortfalls billed	500			500
Service, Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 28,500			$ 63,200