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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

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