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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 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 six months ended June 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 |  |  | 99,588 |  |  | 52.96 |
Performance condition adjustment (a) | 94,850 |  |  | 36.45 |  |  | — |  |  | — |
Vested | (68,223) |  |  | 38.70 |  |  | (106,200) |  |  | 35.64 |
Forfeited | (49,259) |  |  | 37.19 |  |  | (45,562) |  |  | 33.76 |
Outstanding, June 30, 2021 | 246,973 |  |  | $ | 39.54 |  |  | 160,592 |  |  | $ | 45.06 |
_______________________________ (a) Represents additional PSUs granted during the six months ended June 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 June 30 |  | Six Months Ended June 30
| 2021 |  | 2020 |  | 2021 |  | 2020
| (thousands)
PSUs | $ | 745 |  |  | $ | 691 |  |  | $ | 1,834 |  |  | $ | 1,301 |
RSUs | 666 |  |  | 980 |  |  | 1,669 |  |  | 2,044 |
Total | $ | 1,411 |  |  | $ | 1,671 |  |  | $ | 3,503 |  |  | $ | 3,345 |

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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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