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Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Federal corporate tax rate |  |  | 21.00% | 35.00% | 35.00%
Reduction in tax rate |  |  | 14.00% |  |
Classified distributions from equity method investees as cash flows from operating activities |  |  | $ 202 | $ 58 |
Cash flows from investing activities |  |  | (9,719) | 5,678 |
Cash flows from operating activities |  |  | (6,396) | (5,702) |
Revenues within scope of updated accounting guidance | $ 49,443 | $ 43,632 | 89,983 | 87,491 |
ASU 2018-02 [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Reclassification of standard tax effects on AOCI and retained earnings |  |  |  |  | $ 0
ASU 2018-02 [Member] | Retained Earnings [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Reclassification of standard tax effects on AOCI and retained earnings |  |  |  |  | (2,100)
ASU 2018-02 [Member] | Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Reclassification of standard tax effects on AOCI and retained earnings |  |  |  |  | 2,100
ASU 2016-15 [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Classified distributions from equity method investees as cash flows from operating activities |  |  | 202 |  |
Cash flows from investing activities |  |  |  | (58) |
Cash flows from operating activities |  |  |  | $ 58 |
ASU 2016-01 [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Cumulative effect adjustment that increased retained earnings and decreased AOCI |  |  |  |  | 0
ASU 2016-01 [Member] | Retained Earnings [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Cumulative effect adjustment that increased retained earnings and decreased AOCI |  |  |  |  | 9,825
ASU 2016-01 [Member] | Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Cumulative effect adjustment that increased retained earnings and decreased AOCI |  |  |  |  | $ (9,825)
ASU 2014-09 [Member] |  |  |  |  |
Adoption of New Accounting Pronouncements [Abstract] |  |  |  |  |
Revenues within scope of updated accounting guidance |  |  | $ 57 |  |
Revenues within scope of updated accounting guidance, as a percentage of total revenues (less than) |  |  | 0.10% |  |

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