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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2013
Equity [Abstract]  
Schedule of Common Stock Outstanding Roll Forward
The changes in common stock outstanding for the three years ended December 31 are as follows:

(in thousands of shares)
2013
 
2012
 
2011
Beginning Balance, January 1
185,658

 
184,641

 
—

Conversion of net investment
—

 
—

 
184,578

Stock incentive plan activity
1,203

 
1,367

 
63

Repurchase of common stock
(2,304
)
 
(350
)
 
—

Ending Balance, December 31
184,557

 
185,658

 
184,641