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Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 30, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 215,954 | $ 193,393 | $ 174,726 | $ 194,127 | $ 189,973 | $ 175,056 | $ 158,594 | $ 167,432 | $ 778,200 | $ 691,055 | $ 598,335
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Instructional costs and services | 92,427 | 83,180 | 75,357 | 78,687 | 78,552 | 71,714 | 67,847 | 70,678 | 329,651 | 288,791 | 254,419
Admissions advisory and related, including $1,575 in 2015; $2,974 in 2014; and $3,412 in 2013, respectively, to related parties | 29,361 | 27,506 | 27,372 | 28,333 | 28,774 | 27,324 | 26,208 | 26,261 | 112,572 | 108,567 | 97,077
Advertising | 18,419 | 19,360 | 18,419 | 20,031 | 16,854 | 16,491 | 15,751 | 16,712 | 76,229 | 65,808 | 60,985
Marketing and promotional | 1,978 | 1,827 | 1,788 | 1,694 | 1,810 | 1,931 | 1,907 | 1,791 | 7,287 | 7,439 | 5,644
General and administrative | 10,634 | 12,536 | 9,534 | 9,396 | 10,447 | 11,640 | 8,994 | 8,554 | 42,100 | 39,635 | 36,934
Total costs and expenses | 152,819 | 144,409 | 132,470 | 138,141 | 136,437 | 129,100 | 120,707 | 123,996 | 567,839 | 510,240 | 455,059
Operating income | 63,135 | 48,984 | 42,256 | 55,986 | 53,536 | 45,956 | 37,887 | 43,436 | 210,361 | 180,815 | 143,276
Interest expense | (414) | (313) | (146) | (375) | (346) | (576) | (356) | (523) | (1,248) | (1,801) | (2,244)
Interest income and other | (691) | 201 | 127 | 257 | 307 | 43 | 197 | 137 | (106) | 684 | 3,863
Income before income taxes | 62,030 | 48,872 | 42,237 | 55,868 | 53,497 | 45,423 | 37,728 | 43,050 | 209,007 | 179,698 | 144,895
Income tax expense | 23,916 | 15,530 | 16,461 | 21,689 | 20,404 | 16,407 | 14,659 | 16,762 | 77,596 | 68,232 | 56,184
Net income | $ 38,114 | $ 33,342 | $ 25,776 | $ 34,179 | $ 33,093 | $ 29,016 | $ 23,069 | $ 26,288 | $ 131,411 | $ 111,466 | $ 88,711
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic income per share | $ 0.83 | $ 0.72 | $ 0.56 | $ 0.75 | $ 0.72 | $ 0.64 | $ 0.51 | $ 0.58 | $ 2.86 | $ 2.45 | $ 1.98
Diluted income per share | $ 0.81 | $ 0.70 | $ 0.55 | $ 0.72 | $ 0.70 | $ 0.62 | $ 0.49 | $ 0.56 | $ 2.78 | $ 2.37 | $ 1.92
Basic weighted average shares outstanding | 46,035 | 46,063 | 46,012 | 45,789 | 45,652 | 45,651 | 45,598 | 45,205 | 45,975 | 45,538 | 44,731
Diluted weighted average shares outstanding | 47,337 | 47,320 | 47,263 | 47,201 | 47,097 | 47,051 | 46,990 | 46,841 | 47,281 | 47,006 | 46,131

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- Definition Costs directly attributable to educational services, including salaries and benefits for full-time faculty, administrators and academic advisors, and costs associated with adjunct faculty. Also includes costs for educational supplies such as books, costs associated with academic records and graduation, costs associated with collections from our students such as bad debt expense, and other university services such as evaluating transcripts. + References No definition available. + Details
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