Pension and Postretirement Plans (Obligation, Asset, and Funding Information) (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at begining of year	$ 1,466,322,000	$ 1,279,315,000
Service cost	46,115,000	40,344,000	27,619,000
Interest cost	55,821,000	59,124,000	60,033,000
Amendments	22,700,000	8,508,000
Actuarial (gain) loss	(156,385,000)	144,286,000
Benefits paid	(81,162,000)	(65,255,000)
Curtailment	(55,690,000)	0
Settlement	(171,377,000)	0
Benefit obligation at end of year	1,126,344,000	1,466,322,000	1,279,315,000
Fair value of assets at beginning of year	2,071,145,000	1,816,577,000
Actual return on plan assets	699,518,000	319,823,000
Employer contributions and other	0	0	0
Benefits paid	(81,162,000)	(65,255,000)
Settlement	(317,652,000)	0
Fair value of assets at end of year	2,371,849,000	2,071,145,000	1,816,577,000
Funded status	1,245,505,000	604,823,000
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at begining of year	104,062,000	92,863,000
Service cost	1,612,000	1,467,000	1,655,000
Interest cost	4,148,000	4,241,000	4,342,000
Amendments	0	0	(369,000)
Actuarial (gain) loss	(9,180,000)	8,428,000
Benefits paid	(4,101,000)	(3,681,000)
Benefits paid and other	(4,101,000)	(2,937,000)
Curtailment	(2,059,000)	0
Settlement	(3,313,000)	0
Benefit obligation at end of year	91,169,000	104,062,000	92,863,000
Fair value of assets at beginning of year	0	0
Employer contributions and other	4,101,000	3,681,000
Benefits paid	(4,101,000)	(3,681,000)
Fair value of assets at end of year	0	0	0
Funded status	(91,169,000)	(104,062,000)
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at begining of year	63,868,000	72,412,000
Service cost	2,488,000	3,113,000	2,872,000
Interest cost	1,848,000	2,735,000	3,063,000
Actuarial (gain) loss	(3,298,000)	(11,493,000)
Benefits paid, net of Medicare subsidy	(3,671,000)	(3,337,000)
Curtailment	(21,221,000)	438,000
Benefit obligation at end of year	40,014,000	63,868,000	72,412,000
Fair value of assets at beginning of year	0	0
Employer contributions and other	3,671,000	3,337,000
Benefits paid, net of Medicare subsidy	(3,671,000)	(3,337,000)
Fair value of assets at end of year	0	0	0
Funded status	$ (40,014,000)	$ (63,868,000)