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Accumulated Other Comprehensive Loss (Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Long-term obligations |  | $ 1,059,896 | $ 944,675 |  | $ 924,905
Securities gains (losses) |  | 4,293 | 26,673 |  | 10,817
Income taxes |  | (219,946) | (125,585) |  | $ (122,028)
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | 3,419 | (12,351) |  |
Unrealized Loss on Cash Flow Hedges |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [2] | 0 | 0 |  |
Unrealized Gains on Investment Securities Available for Sale |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Securities gains (losses) | [1] | 4,293 | 26,673 |  |
Income taxes | [1] | (1,588) | (9,869) |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1],[2] | (2,705) | (16,804) |  |
Defined Benefit Pension Items |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Employee Benefits, prior service costs | [1] | (210) | (210) |  |
Reclassification adjustment for losses included in income before income taxes | [1] | (9,510) | (6,859) |  |
Total before taxes |  | (9,720) | (7,069) | [1] |
Income taxes | [1] | 3,596 | 2,616 |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1],[2] | $ 6,124 | $ 4,453 |  |
[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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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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