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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Data - Unaudited [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
 
Quarter Ended
 
 
Mar. 31 (1)
 
Jun. 30
 
Sept. 30
 
Dec. 31
 
 
(in thousands except per share data)
2016
 
 

 
 

 
 

 
 

Total revenue
 
$
89,855

 
$
96,721

 
$
97,108

 
$
95,688

Gross profit
 
$
49,233

 
$
50,132

 
$
51,273

 
$
50,760

Net income
 
$
18,160

 
$
16,606

 
$
18,806

 
$
9,512

Net income per share:
 
 

 
 

 
 

 
 

Basic
 
$
1.13

 
$
1.03

 
$
1.16

 
$
0.58

Diluted
 
$
1.08

 
$
0.98

 
$
1.09

 
$
0.54

2015
 
 

 
 

 
 

 
 

Total revenue
 
$
81,484

 
$
83,781

 
$
86,016

 
$
90,387

Gross profit
 
$
42,514

 
$
43,761

 
$
46,265

 
$
48,257

Net income
 
$
9,686

 
$
13,570

 
$
16,266

 
$
5,463

Net income per share:
 
 

 
 

 
 

 
 

Basic
 
$
0.62

 
$
0.86

 
$
1.02

 
$
0.34

Diluted
 
$
0.60

 
$
0.83

 
$
0.98

 
$
0.33

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(1) In the second quarter of 2016, we early adopted ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (see Note 1: General and Summary of Significant Accounting Policies). Based on the adoption of this guidance, net income for the quarter ended March 31, 2016 was restated to reflect a
$2.3 million adjustment to the income tax provision impacting net income by the same amount. In addition, for the three months ended March 31, 2016, weighted average common and common equivalent shares outstanding increased by
314,000 shares, which along with the impact of the adjustment to the income tax provision resulted in a net restatement of basic earnings per share to $1.13 from 0.99; and diluted earnings per share to $1.08 from 0.96.