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Share Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] | A summary of changes in the common shares subject to nonvested PBRSUs and TBRSUs for the six months ended June 30, 2019 follows:
| Common shares subject to PBRSUs and TBRSUs
Nonvested at January 1, 2019 | 152,631 |
Granted | 74,440 |
Vested | (27,719 | )
Forfeited | — |
Adjustment for performance conditions of PBRSUs (1) | (3,368 | )
Nonvested at June 30, 2019 (2) | 195,984 |
Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] | The following table details expected additional share-based compensation expense related to PBRSUs and TBRSUs outstanding as of June 30, 2019:
(In thousands) |  |
Six months ending December 31, 2019 |  | $ | 2,590 |
2020 |  | 4,071 |
2021 |  | 2,402 |
2022 |  | 1,043 |
2023 |  | 164 |
Total |  | $ | 10,270 |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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