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Condensed Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Common Stock In Treasury [Member]
Total
Balance, value at Dec. 31, 2009$ 541$ 154,495$ 1,006,903$ (10,093)$ (995,261)$ 156,585
Balance, shares at Dec. 31, 200954,069,000   (18,623,000) 
Net income  276,668  276,668
Other comprehensive income:      
Prior service costs, net of income tax   13 13
Net actuarial pension loss, net of income tax   877 877
Unrealized gain (loss)   56 56
Comprehensive income     277,614
Exercise of stock options and equity awards, value  (13,324) 21,1547,830
Exercise of stock options and equity awards, shares    208,000 
Tax benefit from exercise of stock options and equity award vesting 3,497   3,497
Stock-based compensation 12,707   12,707
Common shares repurchased, value    (314,950)(314,950)
Common shares repurchased, shares    (3,728,000)(3,727,500)
Issuance of shares for Directors' compensation, value  1 2930
Issuance of shares for Directors' compensation, shares    1,000 
Shares tendered for taxes, value    (971)(971)
Shares tendered for taxes, shares    (10,000) 
Balance, value at Sep. 30, 2010541170,6991,270,248(9,147)(1,289,999)142,342
Balance, shares at Sep. 30, 201054,069,000   (22,152,000) 
Net income  97,498  97,498
Other comprehensive income:      
Prior service costs, net of income tax   6,327 6,327
Net actuarial pension loss, net of income tax   (1,737) (1,737)
Unrealized gain (loss)   48 48
Comprehensive income     102,136
Exercise of stock options and equity awards, value  (307) 37063
Exercise of stock options and equity awards, shares    6,000 
Tax benefit from exercise of stock options and equity award vesting 130   130
Stock-based compensation 3,106   3,106
Common shares repurchased, value    (119,706)(119,706)
Common shares repurchased, shares    (1,930,000) 
Shares tendered for taxes, value    (1)(1)
Shares tendered for taxes, shares    0 
Common shares retired, value(170) (842,761) 842,9310
Common shares retired, shares(17,000,000)   17,000,000 
Balance, value at Dec. 31, 2010371173,935524,678(4,509)(566,405)128,070
Balance, shares at Dec. 31, 201037,069,000   (7,076,000) 
Net income  231,704  231,704
Other comprehensive income:      
Prior service costs, net of income tax   (711) (711)
Net actuarial pension loss, net of income tax   824 824
Unrealized gain (loss)   (102) (102)
Comprehensive income     231,715
Exercise of stock options and equity awards, value  (4,678) 9,9645,286
Exercise of stock options and equity awards, shares    148,000 
Tax benefit from exercise of stock options and equity award vesting 1,169   1,169
Stock-based compensation 10,905   10,905
Common shares repurchased, value    (248,099)(248,099)
Common shares repurchased, shares    (3,470,000)(3,470,000)
Issuance of shares for Directors' compensation, value  1 2930
Issuance of shares for Directors' compensation, shares    1,000 
Shares tendered for taxes, value    (614)(614)
Shares tendered for taxes, shares    (9,000) 
Balance, value at Sep. 30, 2011$ 371$ 186,009$ 751,705$ (4,498)$ (805,125)$ 128,462
Balance, shares at Sep. 30, 201137,069,000   (10,406,000)