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Recent Accounting Developments (Narratives) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |
Adjustments related to TCJA |  |  | $ (300) |  |  |  |
Cumulative effect on other comprehensive income |  | $ 7,475 |  | $ 419 | $ 12,182 | $ 1,859 |
ASU 2017-12 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |  |
Cumulative effect on retained earnings |  |  |  |  |  |  | $ 383
Cumulative effect on other comprehensive income | $ (400) |  |  |  |  |  |

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