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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 68,563 | $ 59,754 | $ 56,458 | $ 46,426 | $ 101,891 | $ 99,134 | $ 94,720 | $ 97,351 | $ 231,201 | $ 393,096 | $ 336,597
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Total operating costs and expenses | 72,763 | 78,921 | 76,445 | 90,039 | 86,172 | 82,124 | 86,476 | 83,917 | 318,168 | 338,689 | 302,955
Operating income (loss) | (4,200) | (19,167) | (19,987) | (43,613) | 15,719 | 17,010 | 8,244 | 13,434 | (86,967) | 54,407 | 33,642
Net Income (loss) | $ (2,018) | $ (104,893) | $ (15,357) | $ (35,689) | $ (36,168) | $ 7,695 | $ 2,605 | $ 3,006 | $ (157,957) | $ (22,862) | $ 6,820
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per share - basic (in dollars per share) | $ (0.02) | $ (0.97) | $ (0.14) | $ (0.33) | $ (0.33) | $ 0.07 | $ 0.02 | $ 0.03 | $ (1.46) | $ (0.21) | $ 0.06
Net income (loss) per share - diluted (in dollars per share) | $ (0.02) | $ (0.97) | $ (0.14) | $ (0.33) | $ (0.33) | $ 0.07 | $ 0.02 | $ 0.03 | $ (1.46) | $ (0.21) | $ 0.06
Shares used in per share calculations: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 108,826 | 107,897 | 107,737 | 109,358 | 109,737 | 109,555 | 110,060 | 111,464 | 108,450 | 110,198 | 110,162
Diluted (in shares) | 108,826 | 107,897 | 107,737 | 109,358 | 109,737 | 113,119 | 112,565 | 115,325 | 108,450 | 110,198 | 113,140

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