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Stock-based Compensation Expense Restricted and Performance Stock Unit activity (Tables) | 12 Months Ended
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Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | Restricted and Performance Stock Unit activity is summarized in the following table:
| Units |  | Weighted Average Grant Date Fair Value
Outstanding as of December 31, 2008 | 360,382 |  |  | 25.04 |
Granted | 243,574 |  |  | 14.95 |
Forfeited | (4,847 | ) |  | 24.85 |
Vested | (176,846 | ) |  | 23.60 |
Outstanding as of December 31, 2009 | 422,263 |  |  | 19.82 |
Granted | 191,469 |  |  | 19.18 |
Forfeited | (45,081 | ) |  | 23.45 |
Vested | (103,223 | ) |  | 25.78 |
Outstanding as of December 31, 2010 | 465,428 |  |  | 17.88 |
Granted | 152,657 |  |  | 23.84 |
Forfeited | (106,979 | ) |  | 22.35 |
Vested | (19,702 | ) |  | 23.34 |
Outstanding as of December 31, 2011 | 491,404 |  |  | 18.54 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (c)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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