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Quarterly Results of Operations (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Results of Operations (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 113,005 | $ 108,909 | $ 103,118 | $ 101,709 | $ 100,031 | $ 98,946 | $ 97,322 | $ 89,326 | $ 426,741 | $ 385,625 | $ 261,902
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Instructional costs and services | 50,639 | 48,933 | 46,354 | 48,875 | 45,435 | 45,717 | 51,032 | 36,660 | 194,801 | 178,844 | 101,904
Selling and promotional | 31,166 | 31,248 | 27,709 | 29,832 | 28,538 | 28,103 | 28,976 | 26,876 | 119,955 | 112,493 | 85,405
General and administrative | 8,028 | 7,145 | 7,038 | 6,832 | 7,733 | 6,608 | 6,176 | 6,104 | 29,043 | 26,621 | 21,603
Contract termination fees to related party |  |  |  |  | 9,233 |  |  |  |  | 9,233 |
Lease termination costs | (140) | 922 |  |  |  |  |  |  | 782 |  |
Exit costs |  |  |  |  | 26 | 27 | 116 | 89 |  | 258 | 1,218
Total costs and expenses | 89,693 | 88,248 | 81,101 | 85,539 | 90,965 | 80,455 | 86,300 | 69,729 | 344,581 | 327,449 | 215,330
Operating income | 23,312 | 20,661 | 22,017 | 16,170 | 9,066 | 18,491 | 11,022 | 19,597 | 82,160 | 58,176 | 46,572
Net interest expense | (404) | (150) | (3) | (75) | (170) | (143) | (125) | (283) |  |  |
Income before income taxes | 22,908 | 20,511 | 22,014 | 16,095 | 8,896 | 18,348 | 10,897 | 19,314 | 81,528 | 57,455 | 45,283
Income tax expense | 7,584 | 7,643 | 9,141 | 6,614 | 2,646 | 7,606 | 4,163 | 7,834 | 30,982 | 22,249 | 17,979
Net income | $ 15,324 | $ 12,868 | $ 12,873 | $ 9,481 | $ 6,250 | $ 10,742 | $ 6,734 | $ 11,480 | $ 50,546 | $ 35,206 | $ 27,304
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic income per share | $ 0.35 | $ 0.29 | $ 0.29 | $ 0.21 | $ 0.14 | $ 0.23 | $ 0.15 | $ 0.25 | $ 1.13 | $ 0.77 | $ 0.60
Diluted income per share | $ 0.34 | $ 0.29 | $ 0.29 | $ 0.21 | $ 0.13 | $ 0.23 | $ 0.14 | $ 0.25 | $ 1.12 | $ 0.76 | $ 0.60
Basic weighted average shares outstanding | 44,317 | 44,302 | 44,658 | 45,590 | 45,743 | 45,746 | 45,724 | 45,674 | 44,631 | 45,722 | 45,184
Diluted weighted average shares outstanding | 44,868 | 44,787 | 45,018 | 46,089 | 46,346 | 46,351 | 46,557 | 46,325 | 45,105 | 46,396 | 45,503

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