Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease ROU assets	$ 34,300	$ 34,300
Net Lease Cost [Abstract]
Operating lease cost	1,806	5,396
Variable lease cost	524	1,782
Short-term lease cost	86	263
Sublease income	(119)	(332)
Total operating lease cost	2,297	7,109
Future Minimum Rental Commitments Related to Non-cancelable Operating Leases [Abstract]
2019	1,807	1,807
2020	7,179	7,179
2021	6,429	6,429
2022	5,590	5,590
2023	4,751	4,751
Thereafter	15,892	15,892
Total lease payments	41,648	41,648
Less: interest	(4,878)	(4,878)
Present value of lease liabilities	$ 36,770	$ 36,770
Additional Information Related to Operating Leases [Abstract]
Weighted average remaining lease term, in years	7 years 8 months 15 days	7 years 8 months 15 days
Weighted average discount rate	3.03%	3.03%
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases		$ 4,652
ROU assets obtained in exchange for lease liabilities		$ 38,958
Future Minimum Rental Payments Related to Non-cancelable Operating Leases with Original Terms of One Year or More [Abstract]
2019			$ 6,890
2020			6,467
2021			5,613
2022			4,773
2023			3,972
Thereafter			13,869
Total			$ 41,584