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Selected Financial Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Summary of the quarterly results of operations
The following is a summary of the quarterly results of operations for the years ended December 31, 2017 and 2016 (in thousands, except per share data):
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Full
Year
 
2017
 
 
 
 
 
 
 
 
 
 
Total revenue
$
97,296

 
$
116,092

 
$
108,119

 
$
92,556

 
$
414,063

 
Total operating expenses
90,046

 
103,685

 
98,533

 
82,957

 
375,221

 
Operating income (loss)
7,250

 
12,407

 
9,586

 
9,599

 
38,842

 
Net income (loss)
(289
)
 
386

 
(217
)
 
28,444

 
28,324

 
Net income (loss) attributable to the Company
(13
)
 
(885
)
 
(1,000
)
 
24,920

 
23,022

 
Net income (loss) attributable to common stockholders
(1,686
)
 
(2,592
)
 
(2,707
)
 
23,212

 
16,227

 
Diluted income (loss) attributable to common stockholders per share
$
(0.07
)
 
$
(0.09
)
 
$
(0.09
)
 
$
0.65

 
$
0.51

(1 
) 
Weighted average diluted common shares
27,267

 
31,469

 
31,483

 
38,178

 
34,706

 
2016
 
 
 
 
 
 
 
 
 
 
Total revenue
$
99,797

 
$
112,432

 
$
99,651

 
$
93,977

 
$
405,857

 
Total operating expenses
88,344

 
101,917

 
88,404

 
80,051

 
358,716

 
Operating income (loss)
11,453

 
10,515

 
11,247

 
13,926

 
47,141

 
Net income (loss)
(139
)
 
2,292

 
21,322

 
845

 
24,320

 
Net income (loss) attributable to the Company
(134
)
 
2,188

 
16,858

 
404

 
19,316

 
Net income (loss) attributable to common stockholders
(1,028
)
 
1,210

 
15,864

 
(590
)
 
15,456

 
Diluted income (loss) attributable to common stockholders per share
$
(0.04
)
 
$
0.04

 
$
0.55

 
$
(0.03
)
 
$
0.55

(1 
) 
Weighted average diluted common shares
28,343

 
32,418

 
33,874

 
25,532

 
31,195

 

_________________
(1) The sum of the diluted income (loss) from continuing operations attributable to common stockholders per share for the four quarters in 2017 and 2016 differs from the annual diluted income (loss) from continuing operations attributable to common stockholders per share due to the required method of computing the weighted average diluted common shares in the respective periods.