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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 48,165                  
Other comprehensive income (loss), net 11,749       11,749          
Treasury Stock, Value, Acquired, Cost Method (16,942)         (16,942)        
Redemption of equity component of 3.00% Convertible Notes             (118,121) (118,121)    
Temporary equity adjustment related to 2.25% and 3.00% Convertible Notes             23,745 23,745 (17,511) (17,511)
Issuance of common and treasury shares to employee benefit plans, shares   60                
Issuance of common and treasury shares to employee benefit plans 56 1 (5,935)     5,990        
Stock-based compensation 7,861   7,861              
Tax effect from options exercised and the vesting of restricted shares 1,103   1,103              
Cash dividends (8,210)     (8,210)            
Ending balance at Jun. 30, 2014 $ 967,070 $ 258 $ 259,783 $ 816,056 $ (39,928) $ (69,099)        
Ending balance, shares at Jun. 30, 2014   25,806