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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]

The following table presents the unaudited consolidated operating results by quarter for the years ended December 31, 2015 and 2014:
 
 
 
 
 
 
For the Three Months Ended
(in thousands, except per share data)
 
March 31,
 
June 30,
 
September 30,
 
December 31,
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
 
2014:
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
Revenues
 
$
215,638
 
 
$
228,877
 
 
$
248,473
 
 
$
250,979
 
Gross profit
 
 
27,080
 
 
 
30,528
 
 
 
32,724
 
 
 
42,082
 
Net income
 
 
6,272
 
 
 
7,741
 
 
 
8,404
 
 
 
14,127
 
Basic earnings per share
 
$
0.30
 
 
$
0.36
 
 
$
0.40
 
 
$
0.68
 
Diluted earnings per share
 
$
0.29
 
 
$
0.36
 
 
$
0.39
 
 
$
0.66