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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Dividends Declared
Our Board of Directors declared dividends on our outstanding shares of common stock as follows for the periods presented (in thousands, except per share amounts):

 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
 
Per Share Amount
 
Aggregate Amount
 
Per Share Amount
 
Aggregate Amount
 
Per Share Amount
 
Aggregate Amount
First Quarter
 
$
0.06

 
$
1,301

 
$
0.05

 
$
1,076

 
$
0.05

 
$
1,073

Second Quarter
 
$
0.06

 
$
2,561

 
$
0.06

 
$
1,300

 
$
0.05

 
$
1,077

Third Quarter
 
$
0.06

 
$
2,564

 
$
0.06

 
$
1,299

 
$
0.05

 
$
1,076

Fourth Quarter
 
$
0.06

 
$
2,565

 
$
0.06

 
$
1,299

 
$
0.05

 
$
1,076