Revenue from Contracts with Customers - Contract Assets Table (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018		Sep. 30, 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	$ (1,700)	(4,358)	[1]
Additional estimated revenues recognized	(5,000)	2,140	[2]
Balance at September 30, 2018	2,911	2,911
Contract assets at September 30, 2018
Other current assets				$ 2,748	$ 0
Other assets				163
Total contract assets from contracts with customers	$ 2,911	$ 0		$ 2,911	$ 0

[1] Includes $(1.7) million for the three months ended September 30, 2018.

[2] Includes $(5.0) million for the three months ended September 30, 2018.