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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Condensed Summary of Actual Quarterly Results of Operations
The following is a condensed summary of actual quarterly results of operations for 2015 and 2014 (in thousands, except per share amounts):
 
Revenues
 
Gross Profit
 
Operating
Income
 
Net Income
(Loss)
 
Net Income
(Loss)
Attributable
to Common
Stockholders
 
Basic
Earnings (Loss)
Per Share
 
Diluted
Earnings (Loss)
Per Share
Attributable to
Common
Stockholders1
2015:
 
 
 
 
 
 
 
 
 
 
 
 
 
First
$
220,303

 
$
29,074

 
$
11,198

 
$
3,593

 
$
3,592

 
$
0.12

 
$
0.12

Second
$
217,617

 
$
29,506

 
$
11,588

 
$
3,205

 
$
3,205

 
$
0.11

 
$
0.11

Third
$
202,729

 
$
27,890

 
$
9,946

 
$
2,554

 
$
2,554

 
$
0.09

 
$
0.09

Fourth
$
184,692

 
$
24,352

 
$
5,294

 
$
(2,291
)
 
$
(2,291
)
 
$
(0.08
)
 
$
(0.08
)
2014:
 
 
 
 
 
 
 
 
 
 
 
 
 
First
$
198,071

 
$
24,304

 
$
5,448

 
$
(508
)
 
$
(506
)
 
$
(0.02
)
 
$
(0.02
)
Second
$
215,996

 
$
28,185

 
$
9,047

 
$
2,739

 
$
2,739

 
$
0.09

 
$
0.09

Third
$
213,802

 
$
28,426

 
$
9,705

 
$
1,163

 
$
1,162

 
$
0.04

 
$
0.04

Fourth
$
211,874

 
$
26,773

 
$
9,494

 
$
4,237

 
$
4,235

 
$
0.15

 
$
0.15

(1) 
See Note 11 for discussion on the computation of diluted shares outstanding.