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Consolidated Statements of Changes in Capital - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity:              
Beginning Balance   $ 2,157,944   $ 2,394,414 $ 2,157,944 $ 2,394,414 $ 2,270,580
Common shares reacquired         (169,793) (222,360) (32,454)
Common shares issued for compensation and effect of shares reissued to stock purchase plan         3,629 4,200 4,085
Share-based compensation         9,166 10,056 9,242
Net effect of restricted and performance shares issued and stock options exercised         (4,574) (3,010) (4,066)
Dividends to shareholders         (119,866) (220,464) (64,777)
Other comprehensive income (loss)         (34,349) (1,457) (85,719)
Net income $ 34,948 37,814 $ 65,114 46,731 116,197 196,565 297,523
Ending Balance 1,958,354   2,157,944   1,958,354 2,157,944 2,394,414
Common Stock              
Increase (Decrease) in Stockholders' Equity:              
Beginning Balance   623   621 623 621 619
Common shares reacquired         0 0 0
Common shares issued for compensation and effect of shares reissued to stock purchase plan         0 0 0
Share-based compensation         0 0 0
Net effect of restricted and performance shares issued and stock options exercised         2 2 2
Dividends to shareholders         0 0 0
Other comprehensive income (loss)         0 0 0
Net income         0 0 0
Ending Balance 625   623   625 623 621
Additional Paid-in Capital              
Increase (Decrease) in Stockholders' Equity:              
Beginning Balance   359,577   349,894 359,577 349,894 341,780
Common shares reacquired         0 0 0
Common shares issued for compensation and effect of shares reissued to stock purchase plan         1,232 2,639 2,940
Share-based compensation         9,166 10,056 9,242
Net effect of restricted and performance shares issued and stock options exercised         (4,576) (3,012) (4,068)
Dividends to shareholders         0 0 0
Other comprehensive income (loss)         0 0 0
Net income         0 0 0
Ending Balance 365,399   359,577   365,399 359,577 349,894
Accumulated Other Comprehensive Income (Loss)              
Increase (Decrease) in Stockholders' Equity:              
Beginning Balance   58,204   59,661 58,204 59,661 145,380
Common shares reacquired         0 0 0
Common shares issued for compensation and effect of shares reissued to stock purchase plan         0 0 0
Share-based compensation         0 0 0
Net effect of restricted and performance shares issued and stock options exercised         0 0 0
Dividends to shareholders         0 0 0
Other comprehensive income (loss)         (34,349) (1,457) (85,719)
Net income         0 0 0
Ending Balance 23,855   58,204   23,855 58,204 59,661
Retained Earnings              
Increase (Decrease) in Stockholders' Equity:              
Beginning Balance   1,991,704   2,015,603 1,991,704 2,015,603 1,782,857
Common shares reacquired         0 0 0
Common shares issued for compensation and effect of shares reissued to stock purchase plan         0 0 0
Share-based compensation         0 0 0
Net effect of restricted and performance shares issued and stock options exercised         0 0 0
Dividends to shareholders         (119,866) (220,464) (64,777)
Other comprehensive income (loss)         0 0 0
Net income         116,197 196,565 297,523
Ending Balance 1,988,035   1,991,704   1,988,035 1,991,704 2,015,603
Treasury Stock              
Increase (Decrease) in Stockholders' Equity:              
Beginning Balance   $ (252,164)   $ (31,365) (252,164) (31,365) (56)
Common shares reacquired         (169,793) (222,360) (32,454)
Common shares issued for compensation and effect of shares reissued to stock purchase plan         2,397 1,561 1,145
Share-based compensation         0 0 0
Net effect of restricted and performance shares issued and stock options exercised         0 0 0
Dividends to shareholders         0 0 0
Other comprehensive income (loss)         0 0 0
Net income         0 0 0
Ending Balance $ (419,560)   $ (252,164)   $ (419,560) $ (252,164) $ (31,365)