Leases - Maturities of Operating and Financing Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating
2019			$ 3,438
2020			6,866
2021			6,455
2022			5,907
2023			2,378
Thereafter			5,499
Total lease payments			30,543
Less: Imputed interest			(7,125)
Present value of lease liabilities	$ 23,418	$ 22,200	23,418
Financing
2019			212
2020			354
2021			201
2022			86
2023			28
Thereafter			0
Total lease payments			881
Less: Imputed interest			(74)
Present value of lease liabilities	$ 807		807
Total
2019			3,650
2020			7,220
2021			6,656
2022			5,993
2023			2,406
Thereafter			5,499
Total lease payments			31,424
Less: Imputed interest			(7,199)
Present value of lease liabilities			$ 24,225