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Shareholders' Equity - AOCI Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance | $ 4,895,846 |
Balance | 4,830,293 | $ 4,895,846
Unrealized appreciation on securities |  |
Pre-tax amounts: |  |
Accumulated other comprehensive income (loss) before tax | 9,066 | 27,021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance | 17,201 |
Other comprehensive loss before reclassifications | (11,010) |
Net current-period other comprehensive loss | (11,010) |
Balance | 6,191 | 17,201
Defined Benefit Pension Plan |  |
Pre-tax amounts: |  |
Accumulated other comprehensive income (loss) before tax | (29,651) | (30,144)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance | (18,578) |
Amounts reclassified from accumulated other comprehensive income (loss) | 313 |
Net current-period other comprehensive loss | 313 |
Balance | (18,265) | (18,578)
Accumulated Other Comprehensive Income. |  |
Pre-tax amounts: |  |
Accumulated other comprehensive income (loss) before tax | (20,585) | (3,123)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Balance | (1,377) |
Other comprehensive loss before reclassifications | (11,010) |
Amounts reclassified from accumulated other comprehensive income (loss) | 313 |
Net current-period other comprehensive loss | (10,697) |
Balance | $ (12,074) | $ (1,377)

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