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Capital Stock (Tables)
 6 Months Ended
Jun. 30, 2017
Equity [Abstract]  
Dividends Declared
Quarterly Cash Dividends—The Board declared quarterly cash dividends per share on Common Stock to holders of record of Common Stock and Warrants as follows (in thousands, except per share data):
 
2017
 
2016
 
Per Share
 
Total
Amount
 
Per Share
 
Total
Amount
First quarter
$
0.25

 
$
21,742

 
$
0.25

 
$
23,215

Second quarter
$
0.25

 
$
21,816

 
$
0.25

 
$
22,959

Total quarterly cash dividends declared and paid
$
0.50

 
$
43,558

 
$
0.50

 
$
46,174