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Summarized Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Summarized Quarterly Financial Data (Unaudited)  
Schedule of Quarterly Financial Information

Quarterly financial information for 2018 and 2019 is as follows (in thousands except per share data):

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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:

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​

 

  

​

 

  

​

 

  

Basic

​

$

0.88

​

$

0.48

​

$

(2.97)

​

$

1.05

Diluted

​

$

0.84

​

$

0.46

​

$

(2.97)

​

$

1.02

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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