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Financial Instruments and Fair Value Measurements (Details Textual) |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 29, 2016 USD ($) payment | Jun. 30, 2017 USD ($) payment | Dec. 31, 2016 USD ($) | Apr. 22, 2016 USD ($)
Land [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Tangible Asset Impairment Charges |  | $ 0 | $ 0 |
Initial Montana Acquisition [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration Maximum | $ 2,000,000 |  |  |
Business Combination, Contingent Consideration Arrangements, Number of Periodic Payment | payment | 4 | 4 |  |
Fair value of intangible assets acquired | $ 14,400,000 |  |  |
Initial Montana Acquisition [Member] | Fair Value, Inputs, Level 3 [Member] | Non-recurring Basis [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value of intangible assets acquired | $ 14,400,000 |  |  |
Initial Montana Acquisition [Member] | Other Accrued Expenses and Other Long-term Obligations [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability |  | $ 2,000,000 |  |
Second Montana Acquisition [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value of intangible assets acquired |  |  |  | $ 11,400,000
Second Montana Acquisition [Member] | Fair Value, Inputs, Level 3 [Member] | Non-recurring Basis [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair value of intangible assets acquired |  |  |  | $ 11,400,000

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