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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016
September 30, 2015
 
September 30, 2016
September 30, 2015
Cash dividends to common stockholders
$
1,528

$
1,316

 
$
4,573

$
3,936

Cash dividends per common share
$
0.25

$
0.22

 
$
0.75

$
0.66