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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2015
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; unaudited)
June 30, 2015
June 30, 2014
 
June 30, 2015
June 30, 2014
Cash dividends to common stockholders
$
1,313

$
1,123

 
$
2,620

$
2,243

Cash dividends per common share
$
0.22

$
0.19

 
$
0.44

$
0.38