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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 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
 
Six months ended
(in thousands, except per share data)
June 30, 2016
June 30, 2015
 
June 30, 2016
June 30, 2015
Cash dividends to common stockholders
$
1,526

$
1,313

 
$
3,044

$
2,620

Cash dividends per common share
$
0.25

$
0.22

 
$
0.50

$
0.44