Leases Lessee Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lease, Cost [Abstract]
Operating lease costs	$ 7,424	$ 7,385
Variable lease costs	1,427	1,253
Sublease income	(145)	(140)
Total operating lease cost	8,706	8,498
Cash paid for amounts included in the measurement of lease liabilities	7,758	7,673
ROU lease assets obtained in exchange for new operating lease liabilities	$ 8,666	$ 6,638
Weighted-average remaining lease term - operating leases, in years	8 years 4 months 20 days
Weighted-average discount rate - operating leases	3.26%