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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Balance, at Dec. 31, 2012 $ 1,778,355 $ 23,488 $ 1,347,762 $ 5,820 $ 401,285
Balance, Shares at Dec. 31, 2012   187,908      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   3,823      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax 5,404 $ 478 4,926    
Stock-based compensation expense 35,612   35,612    
Tax benefit related to stock options and restricted stock units 2,596   2,596    
Net income 164,947       164,947
Unrealized gains (losses) on marketable securities:          
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively (1,097)     (1,097)  
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively (447)     (447)  
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(159), respectively (276) [1]     (276)  
Balance, at Dec. 31, 2013 1,985,094 $ 23,966 1,390,896 4,000 566,232
Balance, Shares at Dec. 31, 2013   191,731      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   3,661      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax 9,273 $ 458 8,815    
Warrant settlement   $ 2,653 (2,653)    
Warrant settlement Shares   21,221      
Stock-based compensation expense 39,868   39,868    
Tax benefit related to stock options and restricted stock units 209   209    
Cash dividends (37,425)       (37,425)
Net income 81,272       81,272
Unrealized gains (losses) on marketable securities:          
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively 2,417     2,417  
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively (1,433)     (1,433)  
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(159), respectively (295) [1]     (295)  
Balance, at Dec. 31, 2014 2,078,980 $ 27,077 1,437,135 4,689 610,079
Balance, Shares at Dec. 31, 2014   216,613      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax (in shares)   2,649      
Issuance of stock to employees under benefit plans, net of shares withheld for payroll tax 8,933 $ 331 8,602    
Stock-based compensation expense 30,285   30,285    
Repurchase of common stock $ (299,949) $ (1,953)     (297,996)
Repurchase of common stock (in shares) (15,621) (15,621)      
Tax benefit related to stock options and restricted stock units $ 4,625   4,625    
Cash dividends (50,732)       (50,732)
Net income 206,477       206,477
Foreign currency translation adjustment (8,759)     (8,759)  
Unrealized gains (losses) on marketable securities:          
Unrealized (losses) gains on marketable securities arising during period, net of tax of $(1,667), $1,449, $(216), respectively (3,075)     (3,075)  
Less: Reclassification adjustment for gains included in net income, net of tax of $(390), $(645), $(257), respectively (704)     (704)  
Amortization of prior service (credit) cost included in net periodic pension and post-retirement expense/income, net of tax $(169), $(169), $(159), respectively (295) [1]     (295)  
Balance, at Dec. 31, 2015 $ 1,965,786 $ 25,455 $ 1,480,647 $ (8,144) $ 467,828
Balance, Shares at Dec. 31, 2015   203,641      
[1] The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M: "Retirement Plans."