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Summary of Significant Accounting Policies Adjustment for New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Gaming | $ 440,463 | $ 443,945 |
Food and beverage | 85,399 | 86,605 |
Room | 47,912 | 46,850 |
Other | 32,344 | 32,665 |
Total revenues | 606,118 | 610,065 |
Promotional Allowances |  | 0 |
Revenue, Net | 606,118 | 610,065 |
Gaming | 189,035 | 191,933 |
Food and beverage | 82,690 | 84,348 |
Room | 20,933 | 21,307 |
Other | 20,805 | 21,415 |
Selling, general and administrative | 87,583 | 91,613 |
Maintenance and utilities | 27,926 | 26,399 |
Depreciation, Depletion and Amortization, Nonproduction | 51,276 | 53,964 |
Corporate expense | 25,857 | 20,798 |
Project development, preopening and writedowns | 3,440 | 2,972 |
Other operating items, net | 1,799 | 486 |
Total operating costs and expenses | 511,344 | 515,235 |
Operating income | 94,774 | 94,830 |
Interest income | (457) | (460) |
Interest Expense | 44,259 | 43,674 |
Gain Loss on Early Retirements of Debt |  | 156 |
Other Nonoperating Income (Expense) |  | 111 |
Total other expense (income), net | 43,483 | 43,481 |
Income from continuing operations before income taxes | 51,291 | 51,349 |
Income tax provision | (9,892) | (16,273) |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | 35,076 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent | 0 | 375 |
Net income | $ 41,399 | $ 35,451 |
Continuing operations | $ 0.36 | $ 0.31 |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  | 0.00 |
Basic net income per common share | $ 0.36 | $ 0.31 |
Weighted average basic shares outstanding | 114,375 | 115,269 |
Continuing operations | $ 0.36 | $ 0.31 | $ 0.31
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  |  | 0.00
Diluted net income per common share | $ 0.36 | $ 0.31 | $ 0.31
Weighted average diluted shares outstanding | 115,154 | 115,902 | 115,902
Adjustments [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Gaming |  | $ (56,054) |
Food and beverage |  | (838) |
Room |  | (476) |
Other |  | (1,373) |
Total revenues |  | (58,741) |
Promotional Allowances |  | (63,464) |
Revenue, Net |  | 4,723 |
Gaming |  | (39,698) |
Food and beverage |  | 34,830 |
Room |  | 8,193 |
Other |  | 1,436 |
Selling, general and administrative |  | 0 |
Maintenance and utilities |  | 0 |
Depreciation, Depletion and Amortization, Nonproduction |  | 0 |
Corporate expense |  | 0 |
Project development, preopening and writedowns |  | 0 |
Other operating items, net |  | 0 |
Total operating costs and expenses |  | 4,761 |
Operating income |  | (38) |
Interest income |  | 0 |
Interest Expense |  | 0 |
Gain Loss on Early Retirements of Debt |  | 0 |
Other Nonoperating Income (Expense) |  | 0 |
Total other expense (income), net |  | 0 |
Income from continuing operations before income taxes |  | (38) |
Income tax provision |  | 0 |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | (38) |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 0 |
Net income |  | $ (38) |
Continuing operations |  | $ 0.00 |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  | 0.00 |
Basic net income per common share |  | $ 0.00 |
Weighted average basic shares outstanding |  | 0 |
Continuing operations |  |  | $ 0.00
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  |  | 0.00
Diluted net income per common share |  |  | $ 0.00
Weighted average diluted shares outstanding |  |  | 0
As Previously Reported [Member] |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Gaming |  | $ 499,999 |
Food and beverage |  | 87,443 |
Room |  | 47,326 |
Other |  | 34,038 |
Total revenues |  | 668,806 |
Promotional Allowances |  | 63,464 |
Revenue, Net |  | 605,342 |
Gaming |  | 231,631 |
Food and beverage |  | 49,518 |
Room |  | 13,114 |
Other |  | 19,979 |
Selling, general and administrative |  | 91,613 |
Maintenance and utilities |  | 26,399 |
Depreciation, Depletion and Amortization, Nonproduction |  | 53,964 |
Corporate expense |  | 20,798 |
Project development, preopening and writedowns |  | 2,972 |
Other operating items, net |  | 486 |
Total operating costs and expenses |  | 510,474 |
Operating income |  | 94,868 |
Interest income |  | (460) |
Interest Expense |  | 43,674 |
Gain Loss on Early Retirements of Debt |  | 156 |
Other Nonoperating Income (Expense) |  | 111 |
Total other expense (income), net |  | 43,481 |
Income from continuing operations before income taxes |  | 51,387 |
Income tax provision |  | (16,273) |
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | 35,114 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 375 |
Net income |  | $ 35,489 |
Continuing operations |  | $ 0.31 |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share |  | 0.00 |
Basic net income per common share |  | $ 0.31 |
Weighted average basic shares outstanding |  | 115,269 |
Continuing operations |  |  | $ 0.31
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share |  |  | 0.00
Diluted net income per common share |  |  | $ 0.31
Weighted average diluted shares outstanding |  |  | 115,902

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