Revenue - Contract Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contract with Customer, Asset, Net, Current [Roll Forward]
Contract with Customer, Receivable, Net, Current	$ 309,075	$ 184,993
Contract with Customer, Receivable, Current, Net Increase (Decrease)	(12,720)	124,082
Contract with Customer, Receivable, Net, Current	296,355	309,075
Contract with Customer, Asset, Gross, Current	2,833	0
Contract with Customer, Contract Asset, Current, Net Increase (Decrease)	28,692	2,833
Contract with Customer, Asset, Gross, Current	31,525	2,833
Contract with Customer, Asset, Net, Noncurrent [Roll Forward]
Contract with Customer, Receivable, Net, Noncurrent	60,948	34,008
Contract with Customer, Receivable, NonCurrent, Net Increase (Decrease)	2,606	26,940
Contract with Customer, Receivable, Net, Noncurrent	63,554	60,948
Contract with Customer, Asset, Gross, Noncurrent	541	0
Increase (Decrease) in Contract Receivables, Net	1,963	541
Contract with Customer, Asset, Gross, Noncurrent	2,504	541
Contract with Customer, Liability, Current [Roll Forward]
Contract with Customer, Liability, Current	4,016	3,147
Contract with Customer, Liability, Current, Net Increase (Decrease)	(1,524)	869
Contract with Customer, Liability, Current	2,492	4,016
Contract with Customer, Liability, Noncurrent [Roll Forward]
Contract with Customer, Liability, Noncurrent	1,731	1,834
Contract with Customer, Liability, Noncurrent, Net Increase (Decrease)	(1,116)	(103)
Contract with Customer, Liability, Noncurrent	$ 615	$ 1,731