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Net income Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] The following table reconciles basic net income per common share to diluted net income per share for the three months ended March 31, 2019 and 2018, respectively:
 
 
Three Months Ended 
 March 31,
(in thousands, except per share amounts)
2019
 
2018
Net income available to common stockholders
$
22,662

 
$
25,429

Basic weighted-average shares outstanding
44,874

 
46,615

Dilutive effect of potential common stock equivalents — stock options and restricted stock units
339

 
394

Diluted weighted-average shares outstanding
45,213

 
47,009

Earnings per common share:
 

 
 

Basic
$
0.51

 
$
0.55

Diluted
$
0.50

 
$
0.54