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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock
Additional Paid-in-Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
3.00% Convertible Notes [Member]
3.00% Convertible Notes [Member]
Additional Paid-in-Capital
2.25% Convertible Notes [Member]
2.25% Convertible Notes [Member]
Additional Paid-in-Capital
Beginning balance at Dec. 31, 2013 $ 1,035,175 $ 257 $ 368,641 $ 776,101 $ (51,677) $ (58,147)        
Beginning balance, shares at Dec. 31, 2013   25,746                
Net income 74,327                  
Other comprehensive income (loss), net (7,823)       (7,823)          
Treasury Stock, Value, Acquired, Cost Method (33,771)         (33,771)        
Redemption of equity component of 3.00% Convertible Notes           (36,860) (118,003) (118,003) (16,071) 20,789
Call Options and Warrant Equity Settlement           (33,772) 32,641 32,641 0 33,772
Temporary equity adjustment related to 2.25% and 3.00% Convertible Notes (14,163)   (14,163)              
Issuance of common and treasury shares to employee benefit plans, shares   15                
Issuance of common and treasury shares to employee benefit plans 186 1 (8,684)     8,869        
Stock-based compensation 11,836   11,836              
Tax effect from options exercised and the vesting of restricted shares 1,103   1,103              
Cash dividends (12,254)     (12,254)            
Ending balance at Sep. 30, 2014 $ 985,325 $ 258 $ 286,354 $ 838,174 $ (59,500) $ (79,961)        
Ending balance, shares at Sep. 30, 2014   25,761