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Condensed Consolidated Statements of Stockholder's Equity (USD $)
In Thousands, unless otherwise specified
Total
Common stock
Additional paid-in capital
Accumulated other comprehensive income (loss)
Retained earnings
Balances at Dec. 31, 2011 $ 1,914,073 $ 7,032 $ 768,247 $ 469,982 $ 668,812
Increase (Decrease) in Stockholder's Equity          
Net income (loss) 115,948       115,948
Other comprehensive income (loss), net of income taxes 92,759     92,759  
Dividends (103,200)       (103,200)
Capital contribution - stock-based compensation 1,121   1,121    
Income tax benefit on stock options exercised 46   46    
Balances at Jun. 30, 2012 2,020,747 7,032 769,414 562,741 681,560
Balances at Dec. 31, 2012 2,136,297 7,032 771,041 635,699 722,525
Increase (Decrease) in Stockholder's Equity          
Net income (loss) 62,780       62,780
Other comprehensive income (loss), net of income taxes (324,017)     (324,017)  
Dividends (46,435)       (46,435)
Capital contribution - stock-based compensation 1,266   1,266    
Income tax benefit on stock options exercised 53   53    
Balances at Jun. 30, 2013 $ 1,829,944 $ 7,032 $ 772,360 $ 311,682 $ 738,870