Revenue Recognition Revenue Recogntion Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability	$ 220,882	$ 231,451	$ 220,882	$ 231,451	$ 223,523	$ 226,164	$ 234,092	$ 236,730
Payments received and deferred	0	0	0	0
Recognized in revenue	$ (2,641)	$ (2,641)	$ (5,282)	$ (5,279)