Lease Commitments - Supplemental Balance Sheet and Cash Flow Information Related to Operating Leases (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 26,355
Operating lease liabilities	30,381
Cash paid for amounts included in the measurement of operating lease liabilities	4,445
Right-of-use assets obtained in exchange for new operating lease obligations	$ 353
Weighted average remaining lease term for operating leases	9 years
Weighted average discount rate for operating leases	4.71%