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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ 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 Data [Abstract]                      
Total revenue $ 102,765 $ 70,624 $ 69,851 $ 68,303 $ 66,325 $ 65,270 $ 63,053 $ 63,082      
Net income (loss) attributable to stockholders $ (30,072) $ (8,232) $ (1,193) $ 1,106 $ 3,689 $ 2,464 $ 560 $ 2,219 $ (38,391) $ 8,932 $ 13,360
Net income (loss) per share - basic and diluted $ (0.17) $ (0.04) $ (0.01) $ 0.01 $ 0.02 $ 0.01 $ 0.00 $ 0.01 $ (0.21) $ 0.05 $ 0.07