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SELECTED QUARTERLY INFORMATION - UNAUDITED (Selected Quarterly Information) (Details) - USD ($) $ / shares in Units, $ 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
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue, net | $ 241,160 | $ 226,367 | $ 212,673 | $ 202,534 | $ 219,074 | $ 197,523 | $ 197,043 | $ 183,077 | $ 882,734 | $ 796,717 | $ 696,832
Gross margin | 151,159 | 140,298 | 137,422 | 127,313 | 134,050 | 123,627 | 123,538 | 112,556 | 556,192 | 493,771 |
Net (loss) income | $ 14,980 | $ (31,881) | $ 12,020 | $ 11,732 | $ 20,405 | $ 8,990 | $ 4,282 | $ 2,618 | $ 6,851 | $ 36,295 | $ 22,027
Income from continuing operations | $ 0.41 | $ (0.90) | $ 0.36 | $ 0.36 | $ 0.63 | $ 0.28 | $ 0.13 | $ 0.08 | $ 0.20 | $ 1.12 | $ 0.78
Income from continuing operations | $ 0.39 | $ (0.90) | $ 0.35 | $ 0.35 | $ 0.62 | $ 0.27 | $ 0.13 | $ 0.08 | $ 0.19 | $ 1.10 | $ 0.76
Net (loss) income | $ 14,980 | $ (31,881) | $ 4,998 | $ 8,384 | $ 17,166 | $ 9,807 | $ 4,825 | $ 2,206 | $ (3,519) | $ 34,004 | $ (21,067)
Earnings Per Share, Basic (USD per share) | $ 0.41 | $ (0.90) | $ 0.15 | $ 0.26 | $ 0.53 | $ 0.30 | $ 0.15 | $ 0.07 | $ (0.10) | $ 1.05 | $ (0.74)
Earnings Per Share, Diluted (USD per share) | $ 0.39 | $ (0.90) | $ 0.15 | $ 0.25 | $ 0.52 | $ 0.30 | $ 0.15 | $ 0.07 | $ (0.10) | $ 1.03 | $ (0.74)

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