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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Nonvested Share Activity [Table Text Block] | The following summarizes the activity of our PSUs and RSUs awarded under our incentive plan for the nine months ended September 30, 2021:
| PSUs |  | RSUs
| Number of shares |  | Weighted Average Grant-Date Fair Value |  | Number of shares |  | Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2020 | 196,340 |  |  | $ | 35.34 |  |  | 212,766 |  |  | $ | 34.24 |
Granted | 73,265 |  |  | 52.45 |  |  | 101,059 |  |  | 52.95 |
Performance condition adjustment (a) | 94,850 |  |  | 36.45 |  |  | — |  |  | — |
Vested | (68,223) |  |  | 38.70 |  |  | (106,200) |  |  | 35.64 |
Forfeited | (50,022) |  |  | 37.43 |  |  | (46,325) |  |  | 34.07 |
Outstanding, September 30, 2021 | 246,210 |  |  | $ | 39.50 |  |  | 161,300 |  |  | $ | 45.08 |
_______________________________ (a) Represents additional PSUs granted during the nine months ended September 30, 2021, related to the 2020 performance condition adjustment described above.
Stock-Based Compensation Expense Recognized [Table Text Block] | Total stock-based compensation recognized from PSUs and RSUs, net of forfeitures, was as follows:
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2021 |  | 2020 |  | 2021 |  | 2020
| (thousands)
PSUs | $ | 1,190 |  |  | $ | 1,503 |  |  | $ | 3,024 |  |  | $ | 2,804 |
RSUs | 991 |  |  | 991 |  |  | 2,660 |  |  | 3,035 |
Total | $ | 2,181 |  |  | $ | 2,494 |  |  | $ | 5,684 |  |  | $ | 5,839 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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