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Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Long-term obligations | $ 204,882 |  | $ 220,952 |
Securities gains (losses) | 58 |  | (45) |
Amounts reclassified from accumulated other comprehensive income, net of tax | 3,076 | [1] | 2,151 | [1]
Unrealized Loss on Cash Flow Hedges |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Long-term obligations | (813) | [1] | (749) | [1]
Income taxes | 321 | [1] | 296 | [1]
Amounts reclassified from accumulated other comprehensive income, net of tax | 492 | [1],[2] | 453 | [1],[2]
Unrealized Gains on Investment Securities Available for Sale |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Securities gains (losses) | 58 | [1] |  |
Income taxes | (23) | [1] |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | (35) | [1],[2] | 0 | [2]
Defined Benefit Pension Items |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Employee Benefits, prior service costs | (52) | [1] | (53) | [1]
Employee Benefits, actuarial gains | (4,252) | [1] | (2,737) | [1]
Total before taxes | (4,304) |  | (2,790) | [1]
Income taxes | 1,685 | [1] | 1,092 | [1]
Amounts reclassified from accumulated other comprehensive income, net of tax | $ 2,619 | [1],[2] | $ 1,698 | [1],[2]
[1] | Amounts in parentheses indicate debits to profit/loss.
[2] | All amounts are net of tax. Amounts in parentheses indicate debits.

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