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Acquisitions And New Ventures - Pro Forma Information (Details) (Riverwalk Acquisition, USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Riverwalk Acquisition |  |
Business Acquisition, Pro Forma Information [Abstract] |  |
Net revenues | $ 777,746 | $ 741,233
Earnings from continuing operations | $ 63,790 | $ 66,237
Earnings from continuing operations per common share |  |
Basic earnings from continuing operations, in dollars per share | $ 3.71 | $ 3.91
Diluted earnings from continuing operations, in dollars per share | $ 3.65 | $ 3.87
Shares used in computing earnings from continuing operations per common share: |  |
Basic, shares | 17,047 | 16,638
Diluted, shares | 17,475 | 17,125

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