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Consolidated Statement of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in-Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
3.00% Notes [Member]
3.00% Notes [Member]
Additional Paid-in-Capital
2.25% Convertible Notes [Member]
2.25% Convertible Notes [Member]
Additional Paid-in-Capital
2.25% Convertible Notes [Member]
Treasury Stock
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 93,004                    
Other comprehensive income (loss), net (30,307)       (30,307)            
Equity component of 3.00% Convertible Note issuance, net of deferred tax liability (14,163)   (14,163)                
Stock Issued During Period, Shares, Employee Stock Purchase Plans   (22)                  
Stock Issued During Period, Value, Employee Stock Purchase Plan (321)   (13,008)     (12,687)          
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments             $ (118,044) $ (118,044) $ (16,071) $ 20,789  
Stock Issued During Period, Value, Conversion of Convertible Securities                     $ 36,860
Call Options and Warrant Equity Settlement 32,641             $ 32,641 $ 0 $ 33,772 $ (33,772)
Purchases of treasury stock (36,802)         (36,802)          
Stock-based compensation 17,804   17,804                
Cash dividends (17,048)     (17,048)              
Ending balance at Dec. 31, 2014 978,010 $ 257 286,854 852,057 (81,984) (79,174)          
Ending balance, shares at Dec. 31, 2014   25,724                  
Net income 93,999                    
Other comprehensive income (loss), net (56,000)       (56,000)            
Stock Issued During Period, Shares, Employee Stock Purchase Plans   (18)                  
Stock Issued During Period, Value, Employee Stock Purchase Plan 206   (16,701)     (16,907)          
Purchases of treasury stock (99,015)         (99,015)          
Stock-based compensation 20,939   20,939                
Cash dividends (19,887)     (19,887)              
Ending balance at Dec. 31, 2015 918,252 $ 257 291,092 926,169 (137,984) (161,282)          
Ending balance, shares at Dec. 31, 2015   25,706                  
Net income 147,065                    
Other comprehensive income (loss), net (8,960)       (8,960)            
Stock Issued During Period, Shares, Employee Stock Purchase Plans   (43)                  
Stock Issued During Period, Value, Employee Stock Purchase Plan 2,193   (20,963)     (23,156)          
Purchases of treasury stock (129,187)         (129,187)          
Stock-based compensation 20,770   20,770                
Cash dividends (19,933)     (19,933)              
Ending balance at Dec. 31, 2016 $ 930,200 $ 257 $ 290,899 $ 1,053,301 $ (146,944) $ (267,313)          
Ending balance, shares at Dec. 31, 2016   25,663