Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2016
Equity [Abstract]  
Summary of Dividends Declared
For the nine months ended September 30, 2016, the Corporation's Board of Directors declared the following dividends:
Declaration Date
 
Dividend Per Share
 
Record Date
 
Total Amount
 
Payment Date
 
 
 
 
 
 
(in thousands)
 
 
March 15, 2016
 
$
0.17500

 
March 31, 2016
 
$
77,596

 
April 15, 2016
June 15, 2016
 
$
0.17500

 
June 30, 2016
 
$
83,939

 
July 15, 2016
September 15, 2016
 
$
0.17500

 
September 30, 2016
 
$
84,606

 
October 14, 2016