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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Statement of Partners' Capital [Abstract] |  |  |  |
Net income | $ 66,470 | $ 59,663 | $ 127,658 | $ 114,851
Other comprehensive income (loss), before tax: |  |  |  |
Change in net unrealized gain/loss during the period | 45,112 | (74,025) | 66,543 | (95,369)
Change in net unrealized gain on securities transferred to held to maturity | (9,175) | (9,745) | (18,373) | (18,204)
Reclassification adjustment for net (gains) losses included in net income | (2) | (6) | (2) | (11)
Total securities available for sale and transferred securities | 35,935 | (83,776) | 48,168 | (113,584)
Defined-benefit post-retirement benefit plans: |  |  |  |
Change in the net actuarial gain/loss | 671 | 1,639 | 1,343 | 3,279
Derivatives: |  |  |  |
Change in the accumulated gain/loss on effective cash flow hedge derivatives | 0 | (33) | 0 | (33)
Reclassification adjustments for (gains) losses included in net income: |  |  |  |
Interest rate swaps on variable-rate loans | (9,345) | (9,345) | (18,690) | (18,690)
Interest rate swap on junior subordinated deferrable interest debentures | 0 | 1,103 | 0 | 2,188
Total derivatives | (9,345) | (8,275) | (18,690) | (16,535)
Other comprehensive income (loss), before tax | 27,261 | (90,412) | 30,821 | (126,840)
Deferred tax expense (benefit) related to other comprehensive income | 9,541 | (31,644) | 10,787 | (44,394)
Other comprehensive income (loss), net of tax | 17,720 | (58,768) | 20,034 | (82,446)
Comprehensive income | $ 84,190 | $ 895 | $ 147,692 | $ 32,405

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