Leases (Narrative) (Details)	9 Months Ended
	Sep. 30, 2019 BuildingLease
Leases [Abstract]
Operating leases term description	The Company is obligated under a number of non-cancellable operating lease agreements for land, buildings and equipment with terms, including renewal options reasonably certain to be exercised, extending through 2047
Sublease extension terms	One building lease is subleased for terms extending through 2021
Number of buildings subleased	1
Operating leases, weighted average remaining lease term	21 years 7 months 6 days
Operating leases, weighted-average discount rate	3.79%