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Incentive Compensation Plans Schedule of Stock Options Activity (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Stock Options Assumptions [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes our stock option activity during 2016.
|  | Options |  | Weighted- Average Exercise Price (per option) |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Stock options outstanding as of January 1, 2016 |  | 6.0 |  |  | $ | 9.63 |  |  |  |  |
Exercised |  | (1.2 | ) |  | 9.62 |  |  |  |  |
Stock options outstanding as of December 31, 2016 |  | 4.8 |  |  | $ | 9.83 |  |  | 3.1 |  | $ | 61.0 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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