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Selected Quarterly Financial Data - (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data - (Unaudited)

 
First Quarter
 
Second
  Quarter
 
Third
  Quarter
 
Fourth
  Quarter
 
2018(1)
 
(in thousands, except per share data)
Revenues
$
209,394

 
$
295,441

 
$
291,490

 
$
244,979

 
$
1,041,304

Operating income
$
46,249

 
$
109,016

 
$
111,168

 
$
52,041

 
$
318,474

Income before income taxes
$
30,461

 
$
100,024

 
$
102,443

 
$
40,330

 
$
273,258

Net income
$
25,086

 
$
79,839

 
$
79,959

 
$
31,471

 
$
216,355

Earnings per share:
 
 
 
 
 
 
 
 
 
Basic
$
0.44

 
$
1.41

 
$
1.42

 
$
0.56

 
$
3.83

Diluted
$
0.44

 
$
1.40

 
$
1.41

 
$
0.56

 
$
3.80


 
First
Quarter
 
Second
  Quarter
 
Third
  Quarter
 
Fourth
  Quarter
 
2017 (1)
 
(in thousands, except per share data)
Revenues
$
188,868

 
$
261,016

 
$
269,930

 
$
221,483

 
$
941,297

Operating income
$
45,403

 
$
86,539

 
$
93,063

 
$
64,648

 
$
289,653

Income before income taxes
$
34,279

 
$
76,414

 
$
83,743

 
$
54,781

 
$
249,217

Net income (loss)
$
24,269

 
$
50,685

 
$
57,189

 
$
(9,816
)
 
$
122,327

Earnings (loss) per share:
 
 
 
 
 
 
 
 
 
Basic
$
0.43

 
$
0.90

 
$
1.01

 
$
(0.17
)
 
$
2.16

Diluted
$
0.43

 
$
0.89

 
$
1.01

 
$
(0.17
)
 
$
2.15


(1) The sum of the earnings per share for the four quarters may differ from annual earnings per share due to the required method of computing the weighted average shares in interim periods.