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Other Comprehensive Income (Loss) - Derivative Instruments Included in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  |  | $ 181,321 | $ 172,521
Other comprehensive loss | $ (1,677) | $ (263) | (5,514) | (29)
Ending balance | 184,661 | 179,882 | 184,661 | 179,882
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | 2,066 | 1,055 | 1,544 | 1,163
Unrealized gains (losses) arising during the period | 273 | (31) | 934 | (198)
Related deferred taxes (at a Federal Income Tax rate of 21% for September 30, 2018 and 35% for September 30, 2017) | (57) | 11 | (196) | 70
Other comprehensive loss | 216 | (20) | 738 | (128)
Ending balance | $ 2,282 | $ 1,035 | $ 2,282 | $ 1,035

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