Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease ROU assets	$ 34,600	$ 34,600
Net Lease Cost [Abstract]
Operating lease cost	1,791	3,590
Variable lease cost	581	1,258
Short-term lease cost	87	177
Sublease income	(112)	(213)
Total operating lease cost	2,347	4,812
Future Minimum Rental Commitments Related to Non-cancelable Operating Leases [Abstract]
2019	3,663	3,663
2020	7,032	7,032
2021	6,184	6,184
2022	5,345	5,345
2023	4,523	4,523
Thereafter	15,432	15,432
Total lease payments	42,179	42,179
Less: interest	(5,044)	(5,044)
Present value of lease liabilities	$ 37,135	$ 37,135
Additional Information Related to Operating Leases [Abstract]
Weighted average remaining lease term, in years	8 years 1 month 2 days	8 years 1 month 2 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		$ 3,070
ROU assets obtained in exchange for lease liabilities		$ 37,749
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