Revenue Revenue, Remaining Performance Obligation (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Revenue [Abstract]
Anticipated recognition of revenue for the remainder of 2019	$ 6,307
Anticipated recognition of revenue in 2020	6,482
Anticipated recognition of revenue in 2021	5,939
Anticipated recognition of revenue in 2022	5,725
Anticipated recognition of revenue in 2023	5,500
Anticipated recognition of revenue thereafter	71,516
Revenue, Remaining Performance Obligation, Amount	$ 101,469