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Summary of Significant Accounting Policies (Other) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of CRDA Deposits [Line Items] |  |  |
Cash and cash equivalents, maturity of qualifying investments, maximum | 3 months |  |
Restricted cash, maturity of qualifying investments, maximum | 90 days |  |
Interest Costs Capitalized |  | $ 500 | $ 100
Self Insurance Reserve [Roll Forward] |  |  |
Self insurance reserve, beginning balance | $ 31,022 | 30,068 | 33,004
Additions |  |  |
Charged to costs and expenses | 84,209 | 79,685 | 80,311
Due to acquisitions | 0 | 14 | 0
Payments made | (81,236) | (78,745) | (83,247)
Self insurance reserve, ending balance | 33,995 | 31,022 | 30,068
Gaming taxes | 324,500 | 321,700 | 332,100
Advertising expense | 29,900 | 32,300 | 33,400
Corporate expense | $ 88,148 | $ 72,668 | $ 76,941

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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