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Summarized Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Summarized Quarterly Financial Data (Unaudited) Summarized Quarterly Financial Data (Unaudited)
Quarterly financial information for 2018 and 2019 is as follows (in thousands except per share data):
 
Quarter
2018
First
 
Second
 
Third
 
Fourth
Revenues
$
116,469

 
$
114,668

 
$
160,945

 
$
242,103

Income from operations
11,328

 
4,184

 
(57,127
)
 
18,875

Net income (loss) 
9,467

 
5,188

 
(52,781
)
 
22,455

Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.88

 
$
0.48

 
$
(2.97
)
 
$
1.05

Diluted
$
0.84

 
$
0.46

 
$
(2.97
)
 
$
1.02

 
Quarter
2019
First
 
Second
 
Third
 
Fourth
Revenues
$
246,508

 
$
245,110

 
$
241,747

 
$
263,772

Income from operations
25,723

 
27,596

 
20,000

 
37,213

Net income 
11,500

 
24,409

 
16,692

 
28,537

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.53

 
$
1.12

 
$
0.77

 
$
1.31

Diluted
$
0.52

 
$
1.10

 
$
0.75

 
$
1.29