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Retirement Agreements And Other Postretirement Benefit Plan (Narrative) (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2012 H | Dec. 31, 2011 | Dec. 31, 2010
Minimum number of years employed in order to participate in the 401(k) plan | 1 year |  |
Minimum number of hours worked annually in order to participate in the 401(k) plan | 1,000 |  |
Definded contribution plan contribution percent | 3.00% |  |
Expenses related to the 401(k) plan | $ 518,000 | $ 479,000 |
Amount accrued for all deferred compensation plan agreements | 6,303,000 | 5,740,000 |
Expected future benefit payouts expected to be paid for 2013 | 3,993 |  |
Expected future benefit payouts expected to be paid for 2014 | 4,462 |  |
Expected future benefit payouts expected to be paid for 2015 | 4,930 |  |
Expected future benefit payouts expected to be paid for 2016 | 5,395 |  |
Expected future benefit payouts expected to be paid for 2017 | 9,489 |  |
Expected future benefit payouts expected to be paid for the next five years thereafter | 100,231 |  |
Amount recognized in accumulated other comprehensive income, before tax | (155,234) | (82,392) | 19,977
Amount recognized in accumulated other comprehensive income, net of tax | $ (102,453) | $ (54,376) |
Minimum [Member] |  |  |
Employee agreement | 2 years |  |

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