Lease Commitments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Leases [Abstract]
Operating lease liability				$ 199,400
Operating lease right-of-use asset				$ 170,600
Lease liability	$ 197,639
Right-of-use asset	165,700
Gross rental income related to buildings	$ 9,400	$ 11,800	$ 9,800