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Recent Accounting Developments (Narratives) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
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Jan. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Income Tax Expense (Benefit) |  | $ (300) |
Cumulative effect on other comprehensive income |  | $ 4,707 | $ 1,440
ASU 2017-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Cumulative effect on retained earnings | $ 400 |  |
Cumulative effect on other comprehensive income | $ (400) |  |

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