Leases - Additional information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 7,751	$ 22,611
Cash payments included in the measurement of lease liabilities reported in operating cash flows	8,031	22,616
Right-of-use assets obtained in exchange for new lease liabilities	2,897	7,009
Lease liability	$ 147,325	$ 147,325
Weighted average discount rate	3.90%	3.90%
Weighted average remaining lease term in years	6 years 3 months 18 days	6 years 3 months 18 days
Maximum
Lessee, Lease, Description [Line Items]
Operating lease term	11 years	11 years
Other assets
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 131,424	$ 131,424
Other liabilities
Lessee, Lease, Description [Line Items]
Lease liability	$ 147,326	$ 147,326