Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Right-of-use assets	$ 17,200
Lease liabilities	$ 18,232
Weighted average discount rate	4.30%
Weighted average remaining lease term	5 years 3 months 18 days
Operating lease costs	$ 5,200	$ 4,600	$ 4,200
Minority interest in partnership
Related Party Transaction [Line Items]
Lease liabilities	$ 11,900