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Quarterly Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Schedule of Quarterly Financial Information
The following is a summary of quarterly results of operations (in thousands, except per share amounts):
 
1st
Quarter
 
2nd
Quarter
 
3rd
Quarter
 
4th
Quarter
2017 (1)
 
 
 
 
 
 
 
Revenues from continuing operations
$
237,917

 
$
253,211

 
$
254,101

 
$
322,971

Operating income from continuing operations
17,753

 
22,948

 
18,923

 
33,671

Net earnings (loss) from continuing operations (2)
9,796

 
(53,918
)
 
(28,229
)
 
94,091

Net earnings from discontinued operations
192

 
192

 
(4,655
)
 
1,026

Weighted average shares:
 
 
 
 
 
 
 
Basic
59,133

 
59,035

 
58,733

 
58,733

Diluted
64,949

 
59,035

 
58,733

 
68,987

Earnings per share from continuing operations
 
 
 
 
 
 
 
Basic
$
0.17

 
$
(0.91
)
 
$
(0.48
)
 
$
1.60

Diluted
$
0.13

 
$
(0.91
)
 
$
(0.48
)
 
$
1.11

2016 (3)
 
 
 
 
 
 
 
Revenues from continuing operations
$
177,385

 
$
176,549

 
$
193,261

 
$
221,675

Operating income from continuing operations
15,351

 
15,801

 
14,456

 
18,140

Net earnings from continuing operations
8,171

 
11,528

 
2,116

 
(755
)
Net earnings from discontinued operations
47

 
47

 
47

 
2,287

Weighted average shares:
 
 
 
 
 
 
 
Basic
63,636

 
63,267

 
59,379

 
59,083

Diluted
65,057

 
66,763

 
60,283

 
59,083

Earnings per share from continuing operations
 
 
 
 
 
 
 
Basic
$
0.13

 
$
0.18

 
$
0.04

 
$
(0.01
)
Diluted
$
0.13

 
$
0.12

 
$
0.04

 
$
(0.01
)