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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment available for sale |  | $ 17,000 | $ 16,800 |
Fair Value, Discount Amount, Available for sales securities |  | 3,000 | 3,100 |
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current |  | 800 | 900 |
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent |  | 2,400 | 2,200 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment available for sale |  | $ 17,456 | 17,259 | $ 20,500
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 |  | $ 17,456 | $ 17,259 |
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 |  | 9.818% | 10.283% |
Peninsula Gaming [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale Securities, Current |  | $ 500 | $ 400 |
Fair Value, Discount Amount, Available for sales securities |  |  | 3,100 |
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current |  |  | 900 |
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Noncurrent |  |  | $ 2,700 |
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 |  | 9.00% | 18.50% |

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