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Recent Accounting Developments (Narratives) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Cumulative effect on other comprehensive income |  | $ 959 | $ 2,290 | $ 13,141 | $ 4,149 |
ASU 2017-12 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Cumulative effect on retained earnings |  |  |  |  |  | $ 383
ASU 2016-02 | Pro Forma |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Right-of-use asset, less than |  | 25,000 |  | 25,000 |  |
Lease liability, less than |  | $ 25,000 |  | $ 25,000 |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Adjustments related to TCJA | $ (300) |  |  |  |  |
Accumulated Deficit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Adjustments related to TCJA | $ 300 |  |  |  |  |
Accumulated Deficit | ASU 2017-12 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |  |  |  |
Cumulative effect on retained earnings |  |  |  |  |  | $ 383

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