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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss, Net of Taxes
Total
Balance at Dec. 31, 2011 $ 1,299 $ 826,121 $ 523,787 $ (7,896) $ 1,343,311
Balance (in shares) at Dec. 31, 2011 129,899,288        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     19,349   19,349
Conversion of 3.25% Convertible Notes 46 56,364     56,410
Conversion of 3.25% Convertible Notes (in shares) 4,635,159        
Exercise of common stock options 3 1,016     1,019
Exercise of common stock options (in shares) 313,028        
Equity-based compensation   2,850     2,850
Other comprehensive income, net of income taxes       3,074 3,074
Balance at Mar. 31, 2012 1,348 886,351 543,136 (4,822) 1,426,013
Balance (in shares) at Mar. 31, 2012 134,847,475        
Balance at Dec. 31, 2012 1,356 911,942 704,565 (6,441) 1,611,422
Balance (in shares) at Dec. 31, 2012 135,637,932       135,637,932
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     45,147   45,147
Preferred stock dividend ($9.17 per share     (1,485)   (1,485)
Deemed dividend related to beneficial conversion feature of preferred stock     (1,086)   (1,086)
Issuance of employee stock award (in shares) 5,715        
Equity-based compensation   1,353     1,353
Other comprehensive income, net of income taxes       (3,679) (3,679)
Balance at Mar. 31, 2013 $ 1,356 $ 913,295 $ 747,141 $ (10,120) $ 1,651,672
Balance (in shares) at Mar. 31, 2013 135,643,647       135,643,647