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Selected Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summarized Quarterly Data
Quarterly financial information for the years ended December 31, 2018 and 2017 is summarized below:
For the Year Ended December 31, 2018
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
(Dollars in thousands except per share amounts)
Revenues(2)
$
43,114

 
$
40,628

 
$
42,476

 
$
43,256

Operating income (loss)(2)(4)
584

 
(2,346
)
 
(1,560
)
 
149

Net income (loss)(2)(4)
345

 
(1,172
)
 
(840
)
 
189

Basic and diluted net income (loss) per common share(1)
0.02

 
(0.06
)
 
(0.04
)
 
0.01

For the Year Ended December 31, 2017
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter(4)
 
(Dollars in thousands except per share amounts)
Revenues(2)
$
41,444

 
$
42,325

 
$
43,636

 
$
43,770

Operating income(2)
1,382

 
2,410

 
3,325

 
3,589

Net income (loss)(2)(3)
854

 
1,498

 
3,727

 
21,384

Basic and diluted net income per common share(1)
0.04

 
0.07

 
0.19

 
(1.07
)
(1)  
Basic and diluted net income (loss) per common share is computed independently for each period presented. As a result, the sum of the quarterly basic and diluted net income (loss) per common share for the years ended December 31, 2018 and 2017 may not equal the total computed for the year.
(2)
Slight variations in totals are due to rounding.
(3)
Fourth quarter 2017 net loss includes $24.2 million from the write-off of the deferred income tax asset related to the 2017 Tax Act (refer to Note 8, "Income Taxes").
(4)
An adjustment of $771 to cost of revenue, identified in the fourth quarter of 2018, has been reflected in this table as a reduction of Operating income (loss) and Net income (loss) of $166, $196 and $359 in the first, second and third quarters, respectively. Income (loss) per common share has been adjusted accordingly for the impact of these adjustments to each quarter.