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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