Leases - Operating Lease Maturities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019	$ 14,615
2020	16,496
2021	13,954
2022	11,223
2023	8,916
Thereafter	18,891
Total undiscounted operating lease liability	84,095
Less: Imputed interest	(14,517)
Total discounted operating lease liability	$ 69,578