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Common Stock (Schedule Of Information Related To Stock Repurchase Programs) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional Shares Authorized For Repurchase |  |  |  |  |  |  |
Total number of shares purchased | 4,478,428 | [1] |  |  |  |  |
Average price paid per share for forfeited restricted shares | $ 0.01 |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs | 4,457,428 |  |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program | $ 30.35 |  |  |  |  |  |
Aggregate purchase price paid | $ 135,298 |  |  |  |  |  |
Maximum number of shares that may yet be purchased under the program |  |  |  |  |  |  | 4,713,548
Restricted shares forfeited under stock purchase plan |  |  | 8,000 |  | 13,000 |  |
Stock Repurchase Programs 2009 [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional Shares Authorized For Repurchase |  |  |  |  |  |  |
Total number of shares purchased |  |  |  |  | 2,574,209 | [1] |
Average price paid per share for forfeited restricted shares |  |  |  |  | 0.01 |  |
Total number of shares purchased as part of publicly announced programs |  |  |  |  | 2,561,209 |  |
Average price paid per share for shares purchased as part of publicly announced program |  |  |  |  | 24.71 |  |
Aggregate purchase price paid |  |  |  |  | 63,288 |  |
Maximum number of shares that may yet be purchased under the program |  |  |  |  | 2,152,339 |  |
Stock Repurchase Programs 2010 [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional Shares Authorized For Repurchase |  |  |  |  |  |  |
Total number of shares purchased |  |  | 301,933 | [1] |  |  |
Average price paid per share for forfeited restricted shares |  |  | 0.01 |  |  |  |
Total number of shares purchased as part of publicly announced programs |  |  | 293,933 |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  |  | 39.22 |  |  |  |
Aggregate purchase price paid |  |  | 11,528 |  |  |  |
Maximum number of shares that may yet be purchased under the program |  |  | 1,858,406 |  |  |  |
Stock Repurchase Programs 2011 [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional Shares Authorized For Repurchase |  |  |  |  |  |  |
Total number of shares purchased | 1,602,286 | [1] |  |  |  |  |
Average price paid per share for forfeited restricted shares | $ 0.01 |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs | 1,602,286 |  |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program | $ 37.75 |  |  |  |  |  |
Aggregate purchase price paid | $ 60,482 |  |  |  |  |  |
Maximum number of shares that may yet be purchased under the program | 256,120 |  |  |  |  |  |
[1] | During 2010 and 2009, there were 8,000 and 13,000, respectively, of restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan which are included in the total number of shares purchased. No such forfeitures occurred during 2011.

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