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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Table Text Block]

 
Year Ended December 31, 2017
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
(as restated)

 
(as restated)

 
(as restated)

 
(as restated)

Revenue
$
264,405

 
$
280,066

 
$
288,523

 
$
305,367

Gross profit
64,704

 
70,046

 
71,921

 
68,787

Net income
5,678

 
4,374

 
7,116

 
(738
)
Net income per share:
 
 
 
 
 
 
 
Basic
$
0.11

 
$
0.08

 
$
0.13

 
$
(0.01
)
Diluted
$
0.10

 
$
0.08

 
$
0.13

 
$
(0.01
)

 
Year Ended December 31, 2016
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
(as restated)

 
(as restated)

 
(as restated)

 
(as restated)

Revenue
$
270,461

 
$
272,212

 
$
276,002

 
$
275,727

Gross profit
61,526

 
65,980

 
66,581

 
68,477

Net income (loss)
(3,136
)
 
(1,905
)
 
4,225

 
4,765

Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
(0.06
)
 
$
(0.04
)
 
$
0.08

 
$
0.09

Diluted
$
(0.06
)
 
$
(0.04
)
 
$
0.08

 
$
0.09