New Authoritative Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2019
Operating Lease, Right-of-Use Asset		$ 41,254
Operating lease liability		$ 49,367
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset	$ 45,400
Operating lease liability	54,000
Accounting Standards Update 2016-02 [Member] | Deferred Gain on Sale of Buildings Reclassified to Retained Earnings [Member]
Impact of Adoption of Accounting Standards Update	$ 2,700