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Schedule of Acquisition Preliminary Purchase Price Allocation(Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Apr. 22, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 105,655 | $ 105,655 |
Second Montana Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash and other current assets |  |  | $ 404
Property and equivalents |  |  | 7,839
Intangible assets |  |  | 11,400
Goodwill |  |  | 6,013
Total acquired assets |  |  | $ 25,656

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