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Fair Value Measurements (Narrative-Balances Measured at Fair Value) (Details) - USD ($) $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 20, 2011 | Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment available for sale |  | $ 15,100 | $ 17,300
Available-for-sale Securities, Current |  | 500 | 500
Fair Value, Discount Amount, Available for sales securities |  | 2,900 | 2,900
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current |  | 900 | 800
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent |  | 1,700 | 2,100
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment available for sale |  | 20,000 |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment available for sale |  | $ 15,591 | 17,752
Debt Security, Interest Rate, Stated Percentage |  | 7.50% |
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment available for sale |  | $ 15,591 | $ 17,752
Available-for-sale Securities [Member] | Discount Rate [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage |  | 11.279% | 9.637%
Kansas Star [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Business Combination, Contingent Consideration Arrangements, Payment to Option Holder, Percentage of EBITDA | 1.00% |  |
Contingent Payments | Discount Rate [Member] | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage |  | 11.00% | 9.20%

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