Pension And Other Retirement Plans Net Periodic Benefit Cost For Pension Benefit Plan (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 198	$ 177	$ 384	$ 346
Interest cost	19,528	20,611	39,097	41,362
Expected return on plans’ assets	(25,236)	(26,895)	(50,563)	(53,808)
Amortization of prior service costs	35	45	58	45
Net periodic benefit credit	$ (5,475)	$ (6,062)	$ (11,024)	$ (12,055)