Leases - Aggregate Future Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating
Remaining 2019	$ 2,638
2020	11,089
2021	11,873
2022	10,292
2023	7,804
Thereafter	27,210
Total lease payments	70,906
Less: Interest	(15,556)
Present value of lease liabilities	55,350
Finance
Remaining 2019	33
2020	133
2021	134
2022	71
2023	10
Thereafter	0
Total lease payments	381
Less: Interest	(38)
Present value of lease liabilities	$ 343
Operating
2019		$ 6,383
2020		5,017
2021		4,422
2022		3,245
2023		2,068
Thereafter		1,966
Total lease payments		$ 23,101