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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Results of Operations
The following is a summary of quarterly results of operations for the years ended December 31, 2018 and 2017:
 
2018 Quarter Ended
 
2017 Quarter Ended
 
Dec 31
 
Sep 30
 
Jun 30
 
Mar 31
 
Dec 31
 
Sep 30
 
Jun 30
 
Mar 31
Revenues
$
246,874

 
$
242,198

 
$
234,545

 
$
236,734

 
$
256,743

 
$
242,451

 
$
247,423

 
$
247,045

Net income (loss) attributable to the Company
$
11,749

 
$
74,028

 
$
7,816

 
$
(33,573
)
 
$
32,751

 
$
17,498

 
$
26,638

 
$
69,243

Net income (loss) attributable to common stockholders per share-basic
$
0.08

 
$
0.52

 
$
0.05

 
$
(0.24
)
 
$
0.23

 
$
0.12

 
$
0.19

 
$
0.48

Net income (loss) attributable to common stockholders per share-diluted
$
0.08

 
$
0.52

 
$
0.05

 
$
(0.24
)
 
$
0.23

 
$
0.12

 
$
0.19

 
$
0.48