Revenues from Contracts with Customers - Contract Liabilities Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Change In Contract With Customer, Liability [Roll Forward]
Contract with Customer, Liability	$ 4,652	$ 132
Sonneborn acquisition		6,463
Contract With Customer, Liability, Increase	10,419	3,968
Contract with Customer, Liability, Revenue Recognized	(9,712)	(3,966)
Contract with Customer, Liability	$ 5,359	$ 6,597