Employee Benefit Plans (Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Document Fiscal Year Focus		2015
Changes in AOCL [Roll Forward]
Accumulated Other Comprehensive Income, Beginning Balance		$ (81,540)
Net actuarial (loss) gain(2)	[1]	(8,359)	$ (33,937)	$ 14,089
Plan amendment	[1]	3,610	0	0
Amortization of prior service credit(2)	[1]	(3,713)	(3,680)	(3,405)
Amortization of actuarial loss(2)	[1]	7,191	3,986	5,369
Settlement cost	[1]	0	1,809	0
Total other comprehensive income (loss)		(14,810)	(62,036)	15,554
Accumulated Other Comprehensive Income, Ending Balance		(96,350)	(81,540)
Pension Plan [Member]
Changes in AOCL [Roll Forward]
Accumulated Other Comprehensive Income, Beginning Balance		(63,257)	(36,184)	(52,239)
Net actuarial (loss) gain(2)		(8,938)	(31,986)	11,414
Plan amendment		3,610	0	0
Amortization of prior service credit(2)		0	33	307
Amortization of actuarial loss(2)		6,306	3,071	4,334
Settlement cost		0	1,809	0
Total other comprehensive income (loss)		978	(27,073)	16,055
Accumulated Other Comprehensive Income, Ending Balance		(62,279)	(63,257)	(36,184)
Other Postretirement Benefits [Member]
Changes in AOCL [Roll Forward]
Accumulated Other Comprehensive Income, Beginning Balance		(1,696)	3,053	3,055
Net actuarial (loss) gain(2)		579	(1,951)	2,675
Plan amendment		0	0	0
Amortization of prior service credit(2)		(3,713)	(3,713)	(3,712)
Amortization of actuarial loss(2)		885	915	1,035
Settlement cost		0	0	0
Total other comprehensive income (loss)		(2,249)	(4,749)	(2)
Accumulated Other Comprehensive Income, Ending Balance		$ (3,945)	$ (1,696)	$ 3,053

[1] See Note 10–Employee Benefit Plans for additional detail of the changes in employee benefit plan assets and benefit obligations that are recognized in other comprehensive income (loss).