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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2010 $ 1,143 $ 1,094,713 $ 6,564 $ (33,732) $ (2,564) $ 1,066,124
Net income     17,175     17,175
Change in other comprehensive income, net of tax       53   53
Common stock dividends     (14,403)     (14,403)
Issuance of common stock 62 59,439     (837) 58,664
Restricted stock compensation   867       867
Tax expense of stock-based compensation   (66)       (66)
Balance at Mar. 31, 2011 1,205 1,154,953 9,336 (33,679) (3,401) 1,128,414
Balance at Dec. 31, 2011 1,268 1,224,572 32,925 (45,148) (3,418) 1,210,199
Net income     21,582     21,582
Change in other comprehensive income, net of tax       1,413   1,413
Common stock dividends     (16,858)     (16,858)
Issuance of common stock 125 138,052 (377)   (769) 137,031
Restricted stock compensation   998       998
Tax expense of stock-based compensation   334       334
Balance at Mar. 31, 2012 $ 1,393 $ 1,363,956 $ 37,272 $ (43,735) $ (4,187) $ 1,354,699