Leases - Maturities of Operating Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the six months ended June 30, 2019)	$ 4,197
2020	8,290
2021	8,095
2022	6,278
2023	5,932
Thereafter	17,063
Total lease payments	49,855
Less imputed interest	(5,942)
Total operating liabilities	$ 43,913