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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 20, 2011 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 16, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment available for sale |  | $ 17,300 | $ 16,800 |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage |  |  | 18.50% |
Available-for-sale securities, current portion |  | 500 | $ 400 |
Fair Value, Discount Amount, Available for sales securities |  | $ 2,900 | 3,100 |
Payment to option holder, percentage of EBITDA |  | 1.00% |  |
Contingent consideration, liability for payments to option holder, current |  | $ 800 | 900 |
Contingent consideration, liability for payments to option holder, noncurrent |  | 2,100 | 2,200 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale securities, gross |  | 20,500 |  |
Investment available for sale |  | $ 17,752 | 17,259 |
Debt security, interest rate |  | 7.50% |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment available for sale |  | $ 17,752 | $ 17,259 |
Kansas Star |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Payment to option holder, percentage of EBITDA | 1.00% |  |  |
Senior Notes | 8.375% Senior Notes due 2018 | Peninsula |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt instrument, stated interest rate |  |  |  | 8.375%
Available-for-sale Securities [Member] | Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 |  | 9.60% | 10.30% |
Contingent Payments | Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 |  | 9.20% |  |

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