Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Summary of Dividends Declared
For the three months ended March 31, 2015, the Corporation's Board of Directors declared the following dividends:
Declaration Date
 
Dividend Per Share
 
Record Date
 
Total Amount (1)
 
Payment Date
 
 
 
 
 
 
(in thousands)
 
 
March 16, 2015
 
$
0.17000

 
March 31, 2015
 
$
71,123

 
April 15, 2015
(1) Net of estimated forfeitures of approximately $5,000 for dividends declared on employee restricted stock awards that are reported in general and administrative on the accompanying consolidated statements of operations.