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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]

17. Quarterly Financial Data (Unaudited)

The following table presents the unaudited consolidated operating results by quarter for the years ended December 31, 2016 and 2015:
 
 
For the Three Months Ended
(in thousands, except per share data)
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2016:
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
Revenues
 
$
253,634
 
 
$
261,934
 
 
$
283,259
 
 
$
343,660
 
Gross profit
 
 
27,281
 
 
 
31,435
 
 
 
34,063
 
 
 
41,944
 
Net income
 
 
1,987
 
 
 
5,500
 
 
 
6,146
 
 
 
7,798
 
Basic earnings per share
 
$
0.10
 
 
$
0.32
 
 
$
0.39
 
 
$
0.49
 
Diluted earnings per share
 
$
0.10
 
 
$
0.31
 
 
$
0.38
 
 
$
0.48
 
2015:
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
Revenues
 
$
244,148
 
 
$
276,488
 
 
$
269,861
 
 
$
271,184
 
Gross profit
 
 
29,374
 
 
 
31,736
 
 
 
28,620
 
 
 
32,611
 
Net income
 
 
7,172
 
 
 
8,074
 
 
 
6,175
 
 
 
5,881
 
Basic earnings per share
 
$
0.35
 
 
$
0.39
 
 
$
0.30
 
 
$
0.29
 
Diluted earnings per share
 
$
0.34
 
 
$
0.38
 
 
$
0.29
 
 
$
0.29
 
Earnings per share amounts for each quarter are required to be computed independently using the weighted average number of shares outstanding during the period. As a result, the sum of the individual quarterly earnings per share amounts may not agree to the earnings per share calculated for the year.