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Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Federal corporate tax rate | 21.00% | 35.00% |
Reduction in tax rate | 14.00% |  |
Revenues within scope of updated accounting guidance | $ 40,540 | $ 43,859 |
ASU 2018-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification of standard tax effects on AOCI and retained earnings |  |  | $ 0
ASU 2018-02 [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification of standard tax effects on AOCI and retained earnings |  |  | (2,100)
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification of standard tax effects on AOCI and retained earnings |  |  | 2,100
ASU 2016-01 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment that increased retained earnings and decreased AOCI |  |  | 0
ASU 2016-01 [Member] | Retained Earnings [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment that increased retained earnings and decreased AOCI |  |  | 9,825
ASU 2016-01 [Member] | Accumulated Other Comprehensive Income [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment that increased retained earnings and decreased AOCI |  |  | $ (9,825)
ASU 2014-09 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Revenues within scope of updated accounting guidance | $ 28 |  |
Revenues within scope of updated accounting guidance, as a percentage of total revenues (less than) | 0.10% |  |

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