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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue:                      
Total revenue $ 76,773 $ 73,779 $ 72,812 $ 72,914 $ 72,040 $ 69,712 $ 76,518 $ 78,288 $ 296,278 $ 296,558 $ 271,501
Operating costs and expenses:                      
Total operating costs and expenses 56,439 56,139 57,258 55,022 54,455 55,244 56,414 55,099 224,858 221,212 249,037
Operating income (loss) 20,334 17,640 15,554 17,892 17,585 14,468 20,104 23,189 71,420 75,346 22,464
Net Income (loss) $ 12,992 $ 182,033 $ 6,861 $ 9,502 $ 7,841 $ 5,513 $ 5,043 $ 7,804 $ 211,388 $ 26,201 $ (33,748)
Net income per share:                      
Net income (loss) per share - basic (in dollars per share) $ 0.12 $ 1.56 $ 0.06 $ 0.08 $ 0.07 $ 0.05 $ 0.04 $ 0.07 $ 1.84 $ 0.23 $ (0.30)
Net income (loss) per share - diluted (in dollars per share) $ 0.11 $ 1.52 $ 0.06 $ 0.08 $ 0.07 $ 0.05 $ 0.04 $ 0.07 $ 1.80 $ 0.22 $ (0.30)
Shares used in per share calculations:                      
Basic (in shares) 111,476 116,444 116,027 115,336 115,024 114,523 114,116 113,590 114,814 114,318 112,415
Diluted (in shares) 113,388 119,542 120,939 117,442 117,620 118,206 117,398 116,629 117,484 117,624 112,415