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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Dividends Declared
The following table summarizes cash dividends paid to common shareholders, recorded as a reduction of retained earnings.
 
Three months ended
 
Six months ended
(in thousands, except per share data)
June 30, 2018
June 30, 2017
 
June 30, 2018
June 30, 2017
Cash dividends to common stockholders
$
2,166

$
1,660

 
$
4,181

$
3,315

Cash dividends per common share
$
0.31

$
0.27

 
$
0.60

$
0.54