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Condensed Consolidated Statement Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Capital In Excess Of Par Value [Member]
Cumulative Dividends In Excess Of Net Income [Member]
Unrealized Gains On Marketable Securities [Member]
Total
Balance, value at Dec. 31, 2010$ 277$ 462,392$ (35,499)$ 15,330$ 442,500
Balance, shares at Dec. 31, 201027,689,392   27,689,392
Comprehensive income:     
Net income  63,018 63,018
Other Comprehensive income:     
Unrealized holding loss arising during the period   (104)(104)
Less: reclassification adjustment for gains included in net income   (9,899)(9,899)
Net gain recognized in other comprehensive income   (10,003)(10,003)
Total comprehensive income    53,015
Shares issued on stock options exercised, shares49,197    
Shares issued on stock options exercised, value 199  199
Share-based compensation 2,912  2,912
Cash Dividends:     
Dividends to common stockholders, $1.845 per share  (51,142) (51,142)
Balance, value at Sep. 30, 2011$ 277$ 465,503$ (23,623)$ 5,327$ 447,484
Balance, shares at Sep. 30, 201127,738,589   27,738,589