Leases - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) lease	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) lease	Jun. 30, 2018 USD ($)
Lease Description
Number of non-cancelable operating leases, lessee (leases) | lease	13		13
Operating lease payments	$ 2,300	$ 2,100	$ 4,600	$ 4,100
Right of use asset	15,700		15,700
Operating lease liability	$ 16,965		$ 16,965
Weighted average operating lease term	7 years		7 years
Operating lease weighted average interest rate (percent)	4.40%		4.40%
Minimum
Lease Description
Lessor operating lease term	1 month		1 month
Maximum
Lease Description
Lessor operating lease term	6 months		6 months