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Stock-based Compensation Plans Stock-based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation, Activity [Table Text Block] | A summary of the RSAs, RSUs, and PSUs granted during 2018 is presented below:
Grant Year |  | Award Type |  | Number of Shares/Units Awarded (in thousands) |  | Vesting Terms
2018 |  | RSA |  | 18 |  | Vest equally over three service periods ending in February of 2019, 2020, and 2021
2018 |  | RSU |  | 16 |  | Vest equally over three service periods ending December 31 of 2018, 2019, and 2020
2018 |  | PSU |  | 16 |  | Three year performance and service period ending December 31, 2020
2018 |  | RSU |  | 3 |  | One year service period ending in April 2019

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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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