Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Leases [Abstract]
Finance leases, 2019 (excluding the nine months ended September 30, 2019)	$ 525
Finance leases, 2020	1,970
Finance leases, 2021	1,615
Finance leases, 2022	1,556
Finance leases, 2023	871
Thereafter	5,024
Finance leases, total minimum lease payments	11,561
Finance leases, imputed interest	(1,586)
Finance lease liabilities	9,975
Operating leases, 2019 (excluding the nine months ended September 30, 2019)	1,255
Operating leases, 2020	5,019
Operating leases, 2021	4,680
Operating leases, 2022	4,215
Operating leases, 2023	4,178
Thereafter	21,262
Operating leases, total minimum lease payments	40,609
Operating leases, imputed interest	(6,290)
Operating lease liabilities	$ 34,319	$ 34,900