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Common Stock Activity (Summary of Share Activity) (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Rollforward of Share Activity, Common and Treasury Shares |  |  |  |  |  |
Common shares outstanding, beginning balance | 76,448,000 |  | 80,569,000 |  | 80,569,000 |
Shares issued for stock option exercises | 313,303 |  | 32,000 |  |  |
Shares issued for restricted stock awards | 35,772 |  | 129,126 |  |  |
Other shares issued, net | 130,000 |  | 5,000 |  |  |
Common stock repurchases |  |  | (2,906,000) | [1] | (4,900,000) | (4,600,000)
Common shares outstanding, ending balance | 76,727,000 |  | 77,829,000 |  | 76,448,000 | 80,569,000
Treasury shares, beginning balance | 9,467,286 |  | 4,594,000 |  | 4,594,000 |
Treasury shares, ending balance | 9,467,286 |  | 7,500,000 |  | 9,467,286 | 4,594,000
Investor [Member] | Common Stock Outstanding [Member] |  |  |  |  |  |
Rollforward of Share Activity, Common and Treasury Shares |  |  |  |  |  |
Shares contributed by shareholder, former owner of acquired business | (200,000) | [2] |  |  |  |
[1] | (1) See Note 2 - Earnings Per Share for share repurchase plan details.
[2] | (2) See Note 12 - Stock-Based Compensation and Other Employee Benefit Plans for contributed share details.

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