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Selected Financial Quarterly 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
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 93,977 $ 99,651 $ 112,432 $ 99,797 $ 88,160 $ 90,759 $ 92,837 $ 77,789 $ 405,857 $ 349,545 $ 307,308
Total operating expenses 80,051 88,404 101,917 88,344 82,773 77,503 73,763 69,530 358,716 303,569 263,558
OPERATING INCOME (LOSS) 13,926 11,247 10,515 11,453 5,387 13,256 19,074 8,259 47,141 45,976 43,750
Net income (loss) 845 21,322 2,292 (139) (6,108) (7,282) 9,124 (425) 24,320 (4,691) 3,538
Net income (loss) attributable to the Company 404 16,858 2,188 (134) (6,390) (6,840) 6,724 (206) 19,316 (6,712) 1,939
Net income (loss) attributable to common stockholders $ (590) $ 15,864 $ 1,210 $ (1,028) $ (7,283) $ (7,735) $ 6,526 $ (206) $ 15,456 $ (8,698) $ 1,939
Diluted income (loss) attributable to common stockholders per share (in dollars per share) $ (0.03) $ 0.55 $ 0.04 $ (0.04) $ (0.26) $ (0.29) $ 0.27 $ (0.01) $ 0.55 $ (0.34) $ 0.07
Weighted average diluted common shares (in shares) 25,532 33,874 32,418 28,343 28,331 27,162 24,773 24,070 31,195 25,888 33,325