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Long-Term Incentive Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Compensation Related Costs [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 year ended December 31, 2020:
|  | PSUs |  | RSUs
|  | Number of shares |  | Weighted Average Grant-Date Fair Value |  | Number of shares |  | Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2019 |  | 295,347 |  |  | $ | 31.09 |  |  | 257,564 |  |  | $ | 31.14 |
Granted |  | 94,850 |  |  | 36.45 |  |  | 125,716 |  |  | 36.45 |
Performance condition adjustment (a) |  | (6,989) |  |  | 29.48 |  |  | — |  |  | — |
Vested |  | (162,622) |  |  | 28.93 |  |  | (143,807) |  |  | 30.88 |
Forfeited |  | (24,246) |  |  | 32.57 |  |  | (26,707) |  |  | 32.82 |
Outstanding, December 31, 2020 |  | 196,340 |  |  | $ | 35.34 |  |  | 212,766 |  |  | $ | 34.24 |
__________________ (a) Represents total PSUs forfeited during the year ended December 31, 2020, related to the 2019 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:
| Year Ended December 31
| 2020 |  | 2019 |  | 2018
| (thousands)
PSUs | $ | 3,795 |  |  | $ | 3,340 |  |  | $ | 4,005 |
RSUs | 4,025 |  |  | 4,633 |  |  | 4,826 |
Total | $ | 7,820 |  |  | $ | 7,973 |  |  | $ | 8,831 |

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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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