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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Current |  | $ 400 |
Assets |  |  |
Restricted cash | $ 26,705 | 16,488 |
Investment available for sale | 17,300 | 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 | 158,832 | 193,862 |
Restricted cash | 26,705 | 16,488 |
Investment available for sale | 17,823 | 17,259 | $ 20,500
Liabilities |  |  |
Business Combination, Contingent Consideration, Liability | 3,019 | 3,038 |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |
Assets |  |  |
Cash and cash equivalents | 158,832 | 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 | 17,823 | 17,259 |
Liabilities |  |  |
Business Combination, Contingent Consideration, Liability | 3,019 | 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 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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