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Basis of Presentation Share-based Compensation (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 249,751 | 104,007 | 972,482 | 803,471 |
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Performance Share Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Equity awards other than options, vested | 0 | 0 | 159,228 | 229,730 |
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Stock Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Options Exercised | 160,119 | 39,418 | 245,113 | 51,134 |
| Share-based comp Options Granted Weighted average exercise price | $ 9.90 | $ 10.26 | $ 10.16 | $ 11.07 |
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Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Equity awards other than options, vested | 89,632 | 64,589 | 568,141 | 522,607 |