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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Long-term obligations |  | $ 924,905 | $ 710,097 |  | $ 740,186
Securities gains (losses) |  | 10,817 | 29,096 |  | 0
Income taxes |  | (122,028) | (65,032) |  | $ (101,574)
Amounts reclassified from accumulated other comprehensive income, net of tax | [1] | (81) | (14,598) |  |
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] | 10,817 | 29,096 |  |
Income taxes | [1] | (4,138) | (11,224) |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1],[2] | (6,679) | (17,872) |  |
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] | (11,376) | (5,148) |  |
Total before taxes |  | (11,586) | (5,358) | [1] |
Income taxes | [1] | 4,988 | 2,084 |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | [1],[2] | $ 6,598 | $ 3,274 |  |
[1] | (Dollars in thousands) Year ended December 31, 2015Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $10,817 Securities gains (4,138) Income taxes $6,679 Net income Amortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (11,376) Employee benefits (11,586) Employee benefits 4,988 Income taxes $(6,598) Net incomeTotal reclassifications for the period $81 Year ended December 31, 2014Details about accumulated other comprehensive income (loss) Amount reclassified from accumulated other comprehensive income (loss)(1) Affected line item in the statement where net income is presentedUnrealized gains and losses on available for sale securities $29,096 Securities gains (11,224) Income taxes $17,872 Net income Amortization of defined benefit pension items Prior service costs $(210) Employee benefitsActuarial losses (5,148) Employee benefits (5,358) Employee benefits 2,084 Income taxes $(3,274) Net incomeTotal reclassifications for the period $14,598 (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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