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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 at Dec. 31, 2011 $ 1,299 $ 826,121 $ 523,787 $ (7,896) $ 1,343,311
Balance at (in shares) at Dec. 31, 2011 129,899,288        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     64,182   64,182
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 4 1,220     1,224
Exercise of common stock options (in shares) 342,371        
Equity-based compensation   3,374     3,374
Equity-based compensation (in shares) 8,877        
Other comprehensive income (loss), net of income taxes       1,072 1,072
Balance at at Jun. 30, 2012 1,349 887,079 587,969 (6,824) 1,469,573
Balance at (in shares) at Jun. 30, 2012 134,885,695        
Balance at at Dec. 31, 2012 1,356 911,942 704,565 (6,441) 1,611,422
Balance at (in shares) at Dec. 31, 2012 135,637,932       135,637,932
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income     121,868   121,868
Preferred stock dividends ($18.54 per share)     (3,004)   (3,004)
Deemed dividend related to beneficial conversion feature of preferred stock     (2,172)   (2,172)
Exercise of common stock options 2 569     571
Exercise of common stock options (in shares) 105,029        
Equity-based compensation   2,886     2,886
Equity-based compensation (in shares) 12,031        
Other comprehensive income (loss), net of income taxes       (5,373) (5,373)
Balance at at Jun. 30, 2013 $ 1,358 $ 915,397 $ 821,257 $ (11,814) $ 1,726,198
Balance at (in shares) at Jun. 30, 2013 135,754,992       135,754,992