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Quarterly Selected Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
Three Months Ended
Year Ended December 31, 2018
March 31
 
June 30
 
September 30
 
December 31
 
 
 
 
 
 
 
 
(In thousands, except per share data)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenues
$
575,295

 
$
592,349

 
$
633,180

 
$
650,963

Gross profit
$
81,198

 
$
77,663

 
$
109,740

 
$
101,396

Income from operations
$
65,167

 
$
44,595

 
$
82,886

 
$
86,490

Reorganization items, net
$
(301
)
 
$
(740
)
 
$
(560
)
 
$
(60
)
Net income
$
59,985

 
$
43,306

 
$
123,192

 
$
86,094

Diluted income per common share
$
2.74

 
$
2.06

 
$
6.10

 
$
4.44


 
Three Months Ended
Year Ended December 31, 2017
March 31
 
June 30
 
September 30
 
December 31
 
 
 
 
 
 
 
 
(In thousands, except per share data)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenues
$
600,975

 
$
549,866

 
$
613,538

 
$
560,244

Gross profit
$
86,707

 
$
63,150

 
$
66,145

 
$
63,460

Income from operations
$
66,985

 
$
42,924

 
$
73,310

 
$
51,117

Reorganization items, net
$
(2,828
)
 
$
(21
)
 
$
(43
)
 
$
494

Net income
$
51,668

 
$
37,160

 
$
68,351

 
$
81,271

Diluted income per common share
$
2.03

 
$
1.48

 
$
2.83

 
$
3.64