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Consolidated Statements Of Changes In Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock [Member]
Treasury Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Beginning Balance at Dec. 31, 2008 $ 1,024   $ 379,104 $ 342,072 $ (38,251) $ 683,949
Beginning Balance, Shares at Dec. 31, 2008 102,397,952          
Common stock dividends declared       (61,612)   (61,612)
Restricted stock grants and cancellations 4   (222)     (218)
Restricted stock grants and cancellations, Shares 434,605          
Exercise of stock options 2   2,243     2,245
Exercise of stock options, Shares 185,801         185,801
Share-based compensation expense     6,371     6,371
Comprehensive income (loss):            
Net income       265,895   265,895
Amortization of treasury locks, net of tax         (1,846) (1,846)
Amortization of unfunded employee benefit obligations, net of tax         3,304 3,304
Unfunded employee benefit obligations, net of tax         757 757
Total comprehensive income           268,110
Ending Balance at Dec. 31, 2009 1,030   387,496 546,355 (36,036) 898,845
Ending Balance, Shares at Dec. 31, 2009 103,018,358          
Common stock repurchases and retirements (17)   (38,884)     (38,901)
Common stock repurchases and retirements, Shares (1,665,392)          
Common stock dividends declared       (61,679)   (61,679)
Restricted stock grants and cancellations 6   507     513
Restricted stock grants and cancellations, Shares 560,845          
Exercise of stock options 4   8,033     8,037
Exercise of stock options, Shares 394,420         394,420
Share-based compensation expense     7,006     7,006
Other     (1,910)     (1,910)
Comprehensive income (loss):            
Net income       205,435   205,435
Amortization of treasury locks, net of tax         (1,309) (1,309)
Unrealized losses on treasury locks, net of tax         (1,039) (1,039)
Unrealized gains (losses) on foreign currency exchange contracts, net of tax         (607) (607)
Amortization of unfunded employee benefit obligations, net of tax         3,583 3,583
Unfunded employee benefit obligations, net of tax         (8,973) (8,973)
Total comprehensive income           197,090
Ending Balance at Dec. 31, 2010 1,023   362,248 690,111 (44,381) 1,009,001
Ending Balance, Shares at Dec. 31, 2010 102,308,231          
Common stock repurchases and retirements (49) (59) (29,098) (93,871)   (123,077)
Common stock repurchases and retirements, Shares (4,896,666) (2,355)        
Common stock dividends declared       (80,307)   (80,307)
Restricted stock grants and cancellations 6   506     512
Restricted stock grants and cancellations, Shares 569,724          
Exercise of stock options 3   7,733     7,736
Exercise of stock options, Shares 343,685         343,685
Share-based compensation expense     9,736     9,736
Other     679     679
Comprehensive income (loss):            
Net income       158,027   158,027
Amortization of treasury locks, net of tax         (1,129) (1,129)
Settlement of treasury lock, net of tax         6,058 6,058
Unrealized losses on treasury locks, net of tax         (30,382) (30,382)
Amortization of net loss on foreign currency exchange contracts, net of tax         4 4
Unrealized gains (losses) on foreign currency exchange contracts, net of tax         190 190
Amortization of unfunded employee benefit obligations, net of tax         3,806 3,806
Unfunded employee benefit obligations, net of tax         (31,944) (31,944)
Total comprehensive income           104,630
Ending Balance at Dec. 31, 2011 $ 983 $ (59) $ 351,804 $ 673,960 $ (97,778) $ 928,910
Ending Balance, Shares at Dec. 31, 2011 98,324,974 (2,355)