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SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information Disclosure Abstract |
Schedule of Quarterly Financial Information [Table Text Block] |
| Quarters Ended
| December 31 |  | September 30 |  | June 30 (2) |  | March 31
| (amounts in thousands, except per share data)
2012 |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ | 102,092 |  | $ | 102,295 |  | $ | 104,571 |  | $ | 79,966
Operating income | $ | 30,951 |  | $ | 29,385 |  | $ | 5,368 |  | $ | 10,890
Net income (loss) | $ | 7,347 |  | $ | 8,177 |  | $ | (3,207) |  | $ | (1,049)
Basic net income (loss) per common share (1) | $ | 0.20 |  | $ | 0.22 |  | $ | (0.09) |  | $ | (0.03)
Weighted average basic common shares outstanding |  | 36,935 |  |  | 36,735 |  |  | 36,686 |  |  | 36,483
Diluted net income (loss) per common share (1) | $ | 0.19 |  | $ | 0.22 |  | $ | (0.09) |  | $ | (0.03)
Weighted average diluted common and common equivalent shares outstanding |  | 37,837 |  |  | 37,548 |  |  | 36,686 |  |  | 36,483
| Quarters Ended
| December 31 |  | September 30 |  | June 30 (3) |  | March 31
| (amounts in thousands, except per share data)
2011 |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ | 95,134 |  | $ | 100,429 |  | $ | 104,650 |  | $ | 82,514
Operating income | $ | 25,920 |  | $ | 22,263 |  | $ | 24,015 |  | $ | 7,275
Net income | $ | 10,524 |  | $ | 8,231 |  | $ | 46,501 |  | $ | 1,021
Basic net income per common share (1) | $ | 0.29 |  | $ | 0.23 |  | $ | 1.28 |  | $ | 0.03
Weighted average basic common shares outstanding |  | 36,380 |  |  | 36,367 |  |  | 36,353 |  |  | 36,053
Diluted net income per common share (1) | $ | 0.28 |  | $ | 0.22 |  | $ | 1.23 |  | $ | 0.03
Weighted average diluted common and common equivalent shares outstanding |  | 37,473 |  |  | 37,463 |  |  | 37,742 |  |  | 37,865
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] |
|  | Quarter Ended June 30, 2011
|  | As |  |  |  |  |  |
|  | Previously |  |  |  |  |  |
|  | Reported |  | Adjustment |  | As Revised
|  | (amounts in thousands, except per share data)
Income taxes (benefit) |  | $ | (29,968) |  | $ | 2,233 |  | $ | (27,735)
Net income (loss) |  | $ | 48,734 |  | $ | (2,233) |  | $ | 46,501
Net income per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.34 |  | $ | (0.06) |  | $ | 1.28
Diluted |  | $ | 1.29 |  | $ | (0.06) |  | $ | 1.23

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