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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue:                      
Total revenue $ 97,559 $ 89,855 $ 76,501 $ 72,682 $ 76,773 $ 73,779 $ 72,812 $ 72,914 $ 336,597 $ 296,278 $ 296,558
Operating costs and expenses:                      
Total operating costs and expenses 97,035 78,039 64,493 63,388 56,439 56,139 57,258 55,022 302,955 224,858 221,212
Operating income (loss) 524 11,816 12,008 9,294 20,334 17,640 15,554 17,892 33,642 71,420 75,346
Net Income (loss) $ (3,445) $ 4,511 $ 3,876 $ 1,878 $ 12,992 $ 182,033 $ 6,861 $ 9,502 $ 6,820 $ 211,388 $ 26,201
Net income per share:                      
Net income (loss) per share - basic (in dollars per share) $ (0.03) $ 0.04 $ 0.04 $ 0.02 $ 0.12 $ 1.56 $ 0.06 $ 0.08 $ 0.06 $ 1.84 $ 0.23
Net income (loss) per share - diluted (in dollars per share) $ (0.03) $ 0.04 $ 0.03 $ 0.02 $ 0.11 $ 1.52 $ 0.06 $ 0.08 $ 0.06 $ 1.80 $ 0.22
Shares used in per share calculations:                      
Basic (in shares) 110,788 110,214 109,904 109,733 111,476 116,444 116,027 115,336 110,162 114,814 114,318
Diluted (in shares) 110,788 113,723 112,061 112,252 113,388 119,542 120,939 117,442 113,140 117,484 117,624