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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 92,556 $ 108,119 $ 116,092 $ 97,296 $ 93,977 $ 99,651 $ 112,432 $ 99,797 $ 414,063 $ 405,857 $ 349,545
Total operating expenses 82,957 98,533 103,685 90,046 80,051 88,404 101,917 88,344 375,221 358,716 303,569
OPERATING INCOME (LOSS) 9,599 9,586 12,407 7,250 13,926 11,247 10,515 11,453 38,842 47,141 45,976
Net income (loss) 28,444 (217) 386 (289) 845 21,322 2,292 (139) 28,324 24,320  
Net income (loss) attributable to the Company 24,920 (1,000) (885) (13) 404 16,858 2,188 (134) 23,022 19,316 (6,712)
Net income (loss) attributable to common stockholders $ 23,212 $ (2,707) $ (2,592) $ (1,686) $ (590) $ 15,864 $ 1,210 $ (1,028) $ 16,227 $ 15,456 $ (8,698)
Diluted income (loss) attributable to common stockholders per share (in dollars per share) $ 0.65 $ (0.09) $ (0.09) $ (0.07) $ (0.03) $ 0.55 $ 0.04 $ (0.04) $ 0.51 $ 0.55 $ (0.34)
Weighted average diluted common shares (in shares) 38,178 31,483 31,469 27,267 25,532 33,874 32,418 28,343 34,706 31,195 25,888