Employee Benefit Plans (Schedule Of Changes In The Benefit Obligation, The Plan Assets, The Funded Status Of Pension Plans And Components Of Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Change in Projected Benefit Obligation:
Benefit obligation at beginning of year	$ 68,390	$ 57,875
Service cost	1,314	3,335	3,325
Interest cost	1,578	3,454	3,212
Actuarial loss	2,005	5,576
Plan amendment (see Note 1)	(29,494)	0
Benefit payments	(1,263)	(1,850)
Benefit obligation at end of year	42,530	68,390	57,875
Change in Plan Assets:
Fair value of plan assets at beginning of year	27,649	27,026
Actual return on plan assets	3,275	(429)
Employer contributions	2,500	2,902
Fair value of plan assets at end of year	32,161	27,649	27,026
Unfunded Status at End of Year:
Unfunded status at end of year	10,369	40,741
Accumulated benefit obligation	42,178	68,075
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	17,254	17,844
Prior service credit	0	117
Total amount recognized	17,254	17,727
Retirement Plan [Member]
Unfunded Status at End of Year:
Unfunded status at end of year	10,369	11,247
Supplemental Retirement Plans [Member]
Unfunded Status at End of Year:
Unfunded status at end of year	$ 0	$ 29,494