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Earnings Per Share (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
Earnings Per Share [Abstract]                      
Class B units unvested 0       2,610,000       0 2,610,000 2,100,000
Numerator for basic and diluted earnings per share:                      
Net (loss) income attributable to stockholders - basic $ (30,072) $ (8,232) $ (1,193) $ 1,106 $ 3,689 $ 2,464 $ 560 $ 2,219 $ (38,391) $ 8,932 $ 13,360
Net (loss) income attributable to convertible OP units                 (3,470) 111 201
Net (loss) income - diluted                 $ (41,861) $ 9,043 $ 13,561
Denominator:                      
Weighted-average shares - basic                 183,784,000 183,876,000 183,678,000
Conversion of OP units                 12,713,000 2,785,000 2,716,000
Effect of dilutive restricted stock awards                 0 4,000 0
Adjusted weighted-average shares - diluted                 196,497,000 186,665,000 186,394,000
Earnings Per Common Share                      
Net (loss) income per share attributable to stockholders - 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
Restricted Stock Awards                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share                 17,200