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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Assets |  |  |
Restricted cash | $ 21,640 | $ 16,488 |
Investment available for sale | 17,000 | 16,800 |
Liabilities |  |  |
Fair Value, Discount Amount, Available for sales securities | 3,000 | 3,100 |
Fair Value, Measurements, Recurring [Member] |  |  |
Assets |  |  |
Cash and cash equivalents | 162,963 | 193,862 |
Restricted cash | 21,640 | 16,488 |
Investment available for sale | 17,456 | 17,259 | $ 20,500
Liabilities |  |  |
Business Combination, Contingent Consideration, Liability | 3,204 | 3,038 |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Assets |  |  |
Cash and cash equivalents | 162,963 | 193,862 |
Investment available for sale | 0 | 0 |
Liabilities |  |  |
Business Combination, Contingent Consideration, Liability | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |
Assets |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash | 0 | 0 |
Investment available for sale | 0 | 0 |
Liabilities |  |  |
Business Combination, Contingent Consideration, Liability | 0 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |
Assets |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash | 0 | 0 |
Investment available for sale | 17,456 | 17,259 |
Liabilities |  |  |
Business Combination, Contingent Consideration, Liability | 3,204 | 3,038 |
Peninsula Gaming [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Current | $ 500 | 400 |
Liabilities |  |  |
Fair Value, Discount Amount, Available for sales securities |  | $ 3,100 |

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