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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 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
(in thousands, except per share data)
March 31, 2018
March 31, 2017
Cash dividends to common stockholders
$
2,015

$
1,655

Cash dividends per common share
$
0.29

$
0.27