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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) |  |  |  |

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