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CONSOLIDATED SUPPLEMENTARY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue: |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 101,891 | $ 99,134 | $ 94,720 | $ 97,351 | $ 97,559 | $ 89,855 | $ 76,501 | $ 72,682 | $ 393,096 | $ 336,597 | $ 296,278
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Total operating costs and expenses | 86,172 | 82,124 | 86,476 | 83,917 | 97,035 | 78,039 | 64,493 | 63,388 | 338,689 | 302,955 | 224,858
Operating income (loss) | 15,719 | 17,010 | 8,244 | 13,434 | 524 | 11,816 | 12,008 | 9,294 | 54,407 | 33,642 | 71,420
Net Income (loss) | $ (36,168) | $ 7,695 | $ 2,605 | $ 3,006 | $ (3,445) | $ 4,511 | $ 3,876 | $ 1,878 | $ (22,862) | $ 6,820 | $ 211,388
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share - basic (in dollars per share) | $ (0.33) | $ 0.07 | $ 0.02 | $ 0.03 | $ (0.03) | $ 0.04 | $ 0.04 | $ 0.02 | $ (0.21) | $ 0.06 | $ 1.84
Net income (loss) per share - diluted (in dollars per share) | $ (0.33) | $ 0.07 | $ 0.02 | $ 0.03 | $ (0.03) | $ 0.04 | $ 0.03 | $ 0.02 | $ (0.21) | $ 0.06 | $ 1.80
Shares used in per share calculations: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 109,737 | 109,555 | 110,060 | 111,464 | 110,788 | 110,214 | 109,904 | 109,733 | 110,198 | 110,162 | 114,814
Diluted (in shares) | 109,737 | 113,119 | 112,565 | 115,325 | 110,788 | 113,723 | 112,061 | 112,252 | 110,198 | 113,140 | 117,484

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