Pension Plans (Components Of Pension Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Pension and Other Postretirement Benefit Expense [Abstract]
Interest cost	$ 2,258	$ 3,472	$ 6,774	$ 10,416
Expected return on plan assets	(1,897)	(2,690)	(5,694)	(8,071)
Actuarial losses	560	1,911	1,677	5,730
Net periodic pension cost	$ 921	$ 2,693	$ 2,757	$ 8,075
WilTel [Member] | United States Pension Plan of US Entity [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension settlement arrangements, distributions paid					$ 110,700