Revenue from Contracts with Customers - Contract Assets Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Change in Contracts with Customer, Asset [Roll Forward]
Balance at December 31, 2017	$ 0
Cumulative effect of adopting Topic 606	5,129
Amounts transferred to Accounts receivable, net from contract assets recognized in the adoption effect	(4,952)
Additional estimated revenues recognized	5,414
Balance at December 31, 2018	5,591
Contract assets at December 31, 2018
Other current assets		$ 5,399	$ 0
Other assets		192
Total contract assets from contracts with customers	$ 0	$ 5,591	$ 0