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Share Based Compensation Share Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of changes in the common shares subject to nonvested PBRSUs and RSUs for the nine months ended September 30, 2018 follows:
| Common shares subject to PBRSUs and RSUs
Nonvested at January 1, 2018 | 116,716 |
Granted | 61,690 |
Vested | (18,800 | )
Forfeited | (4,655 | )
Adjustment for performance conditions of PBRSUs (1) | (2,320 | )
Nonvested at September 30, 2018 | 152,631 |
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] | The following table details expected additional share-based compensation expense related to PBRSUs and RSUs outstanding as of September 30, 2018:
(In thousands) |  |
Three months ending December 31, 2018 |  | $ | 1,047 |
2019 |  | 3,653 |
2020 |  | 2,440 |
2021 |  | 1,030 |
2022 |  | 226 |
Total |  | $ | 8,396 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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