Leases Lessee Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease, Cost [Abstract]
Operating lease costs	$ 7,407	$ 7,487	$ 14,831	$ 14,872
Variable lease costs	1,493	1,068	2,920	2,321
Sublease income	(142)	(155)	(287)	(295)
Total operating lease cost	8,758	8,400	17,464	16,898
Cash paid for amounts included in the measurement of lease liabilities	7,778	7,738	15,536	15,411
ROU lease assets obtained in exchange for new operating lease liabilities	$ 30	$ 6,296	$ 8,696	$ 12,934
Weighted-average remaining lease term - operating leases, in years	8 years 2 months 26 days		8 years 2 months 26 days
Weighted-average discount rate - operating leases	3.26%		3.26%