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Selected Financial Quarterly Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 (in thousands, except per share data):
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Full
Year
 
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

 
2015
 
 
 
 
 
 
 
 
 
 
Total revenue
$
77,789

 
$
92,837

 
$
90,759

 
$
88,160

 
$
349,545

 
Total operating expenses
69,530

 
73,763

 
77,503

 
82,773

 
303,569

 
Operating income (loss)
8,259

 
19,074

 
13,256

 
5,387

 
45,976

 
Net income (loss)
(425
)
 
9,124

 
(7,282
)
 
(6,108
)
 
(4,691
)
 
Net income (loss) attributable to the Company
(206
)
 
6,724

 
(6,840
)
 
(6,390
)
 
(6,712
)
 
Net income (loss) attributable to common stockholders
(206
)
 
6,526

 
(7,735
)
 
(7,283
)
 
(8,698
)
 
Diluted income (loss) attributable to common stockholders per share
$
(0.01
)
 
$
0.27

 
$
(0.29
)
 
$
(0.26
)
 
$
(0.34
)
(1 
) 
Weighted average diluted common shares
24,070

 
24,773

 
27,162

 
28,331

 
25,888

 

_________________
(1) The sum of the diluted income (loss) from continuing operations attributable to common stockholders per share for the four quarters in 2016 and 2015 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.