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Related Party Transactions (Details) - ValleyNet - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
(in thousands) |  |  |
Facility lease revenue | $ 1,677 | $ 2,201 | $ 2,384
Cost of goods and services | 3,362 | 3,673 | $ 3,067
(in thousands) |  |  |
Account receivable related to ValleyNet | 253 | 180 |
Accounts payable related to ValleyNet | $ 173 | $ 303 |

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