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Natural Disasters (Details) (USD $) | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended
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Jun. 30, 2012 | May 12, 2011 seats | Jun. 30, 2012 Flood | Dec. 31, 2011 Flood | Jun. 30, 2012 Harlows Casino | Jun. 30, 2012 Harlows Casino | Feb. 24, 2011 Harlows Casino hotel_rooms | Feb. 24, 2011 Harlows Casino Wind | Mar. 31, 2012 Harlows Casino Wind | Jun. 30, 2012 Harlows Casino Wind | Dec. 31, 2011 Harlows Casino Wind | Jun. 30, 2012 Harlows Casino Flood
Business Interruption Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Seats In Entertainment Center |  | 2,600 |  |  |  |  |  |  |  |  |  |
Insurance Deductible | $ 1,300,000 |  |  |  |  |  |  |  |  | $ 100,000 |  |
Reduction To Property And Equipment Due To Natural Disaster |  |  | 8,500,000 |  |  |  |  | 1,400,000 |  |  |  |
Repair expenditures | 2,000,000 |  |  |  |  |  |  | 400,000 |  |  |  |
Insurance Settlements, Partial Settlement Received |  |  |  | 3,500,000 |  |  |  |  |  |  |  |
Insurance Settlements Receivable |  |  |  |  |  |  |  |  | 3,400,000 |  |  | 12,000,000
Unusual or Infrequent Item, Net of Insurance Proceeds |  |  |  |  | (5,003,000) | (6,514,000) |  |  | 1,500,000 |  |  | 5,000,000
Number Of Hotels Rooms Damaged |  |  |  |  |  |  | 61 |  |  |  |  |
Preliminary Claim For Damages Incurred |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Insurance Settlements Received, Reduction Of Selling And Administrative Expenses Related To The Interruption Of Business |  |  |  |  |  |  |  |  |  |  | 400,000 |
Casualty Losses |  |  |  |  | 10,497,000 | 12,342,000 |  |  |  |  |  |
Insurance Recoveries |  |  |  |  | $ (15,500,000) | $ (18,856,000) |  |  |  |  |  |

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