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Compensation Plans Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation Related Costs [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of the status and activity of non-vested RSUs for the nine months ended September 30, 2015, is presented in the following table:
| RSUs |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year | 515,724 |  |  | $ | 68.29 |
Granted | 356,246 |  |  | $ | 43.72 |
Vested | (267,244 | ) |  | $ | 63.43 |
Forfeited | (41,330 | ) |  | $ | 68.63 |
Non-vested at end of quarter | 563,396 |  |  | $ | 55.04 |
Share-based Compensation, Performance Shares Award Unvested Activity [Table Text Block] | A summary of the status and activity of non-vested PSUs for the nine months ended September 30, 2015, is presented in the following table:
| PSUs (1) |  | Weighted-Average Grant-Date Fair Value
Non-vested at beginning of year | 433,660 |  |  | $ | 73.63 |
Granted | 320,753 |  |  | $ | 45.34 |
Vested | (75,353 | ) |  | $ | 51.59 |
Forfeited | (47,787 | ) |  | $ | 74.42 |
Non-vested at end of quarter | 631,273 |  |  | $ | 61.83 |
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(1) | The number of awards assumes a multiplier of one. The final number of shares of common stock issued may vary depending on the three-year performance multiplier, which ranges from zero to two.

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for unvested performance shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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