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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Financial Information
The following is a summary of certain items in the consolidated statements of operations by quarter: 
Fiscal Year 2018
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenues
$
147,455

 
$
165,649

 
$
172,832

 
$
174,724

Operating income (loss)
$
838

 
$
15,149

 
$
28,884

 
$
(5,138
)
Net (loss) income
$
(3,910
)
 
$
1,704

 
$
22,302

 
$
(13,676
)
Earnings per common share:
 
 
 
 
 
 
—

Basic weighted average common shares outstanding
42,370

 
42,661

 
42,779

 
42,936

Basic earnings per share
$
(0.09
)
 
$
0.04

 
$
0.52

 
$
(0.32
)
Diluted weighted average common shares outstanding
42,370

 
43,916

 
44,175

 
42,936

Diluted earnings per share
$
(0.09
)
 
$
0.04

 
$
0.50

 
$
(0.32
)
Fiscal Year 2017
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenues
$
133,802

 
$
154,016

 
$
160,269

 
$
151,222

Operating income (loss)
$
6,564

 
$
(47,279
)
 
$
18,277

 
$
9,855

Net (loss) income
$
(224
)
 
$
(53,675
)
 
$
12,080

 
$
20,020

Earnings per common share:
 
 
 
 
 
 
 
Basic weighted average common shares outstanding
41,584

 
41,811

 
41,951

 
42,033

Basic earnings per share
$
(0.01
)
 
$
(1.28
)
 
$
0.29

 
$
0.48

Diluted weighted average common shares outstanding
41,584

 
41,811

 
43,295

 
43,394

Diluted earnings per share
$
(0.01
)
 
$
(1.28
)
 
$
0.28

 
$
0.46