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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Dividends Declared
Presented below is a summary of cash dividends paid to common shareholders, recorded as a reduction of retained earnings.
 
Three months ended
 
Nine months ended
(in thousands, except per share data)
September 30, 2017
September 30, 2016
 
September 30, 2017
September 30, 2016
Cash dividends to common stockholders
$
1,788

$
1,528

 
$
5,103

$
4,573

Cash dividends per common share
$
0.29

$
0.25

 
$
0.83

$
0.75