Employee Benefit Plans (Summary Of Fair Value Of Pension Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,438,865	$ 1,281,261
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,438,865	1,281,261	1,105,370
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	443,971	495,769
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	901,118	698,432
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	93,776	87,060	34,520
Defined Benefit Plan, Purchases, Sales, and Settlements		50,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	6,716	2,540
Short-Term Investment Fund [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	65,100	33,569
Short-Term Investment Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	65,100	33,569
Long-term Debt [Member] | Fixed-Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	832,915	511,990
Long-term Debt [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed-Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	91,824	68,340
Long-term Debt [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed-Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	741,091	443,650
Private Fund [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	40,412	36,911	34,520
Defined Benefit Plan, Purchases, Sales, and Settlements		0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	3,501	2,391
Private Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	40,412	36,911
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	53,364	50,149	0
Defined Benefit Plan, Purchases, Sales, and Settlements		50,000
Defined Benefit Plan, Actual Return on Plan Assets Still Held	3,215	149
Hedge Funds, Multi-strategy [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	53,364	50,149
Hedge Funds, Multi-strategy [Member] | Fair Value, Inputs, Level 2 [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0
Hedge Funds, Multi-strategy [Member] | Fair Value, Inputs, Level 3 [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	53,364	50,149
Real Estate Investment Trust Index Fund [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		22,966
Real Estate Investment Trust Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		22,966
Real Estate Investment Trust Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0
U S Large Companies [Member] | S&P 500 Index Fund [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3,482	105,523
U S Large Companies [Member] | S&P 500 Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3,482
U S Large Companies [Member] | S&P 500 Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	105,523
U S Large Companies [Member] | Growth [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	99,050	96,409
U S Large Companies [Member] | Growth [Member] | Fair Value, Inputs, Level 1 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	99,050	96,409
U S Large Companies [Member] | Value [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	101,154	146,501
U S Large Companies [Member] | Value [Member] | Fair Value, Inputs, Level 1 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	101,154	146,501
U S Small Companies [Member] | Growth [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		41,720
U S Small Companies [Member] | Growth [Member] | Fair Value, Inputs, Level 1 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		41,720
U S Small Companies [Member] | Value [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	57,403	58,126
U S Small Companies [Member] | Value [Member] | Fair Value, Inputs, Level 1 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	57,403	58,126
International | Growth [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	91,058	84,673
International | Growth [Member] | Fair Value, Inputs, Level 1 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	91,058	84,673
International | Value [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	94,927	92,724
International | Value [Member] | Fair Value, Inputs, Level 2 [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 94,927	$ 92,724