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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
The following summary represents the unaudited results of operations of the Company, expressed in thousands except per share amounts, for the periods from January 1, 2016 through December 31, 2017. Certain amounts have been reclassified to conform to the current presentation of discontinued operations:
 
 
 
2017
 
 
 
Three Months Ended
 
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue
 
$
26,560
 
$
28,080
 
$
30,387
 
$
33,375
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income
 
$
14,768
 
$
15,067
 
$
12,283
 
$
16,672
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Earnings per Share - diluted
 
$
0.55
 
$
0.56
 
$
0.42
 
$
0.55
 
 
 
 
2016
 
 
 
Three Months Ended
 
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue
 
$
20,224
 
$
21,844
 
$
24,161
 
$
25,299
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income
 
$
7,586
 
$
10,828
 
$
14,476
 
$
12,906
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Earnings per Share - diluted
 
$
0.36
 
$
0.48
 
$
0.61
 
$
0.50