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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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 three months ended March 31, 2019:
| PSUs |  | RSUs
| Number of shares |  | Weighted Average Grant-Date Fair Value |  | Number of shares |  | Weighted Average Grant-Date Fair Value
Outstanding, December 31, 2018 | 429,788 |  |  | $ | 25.90 |  |  | 289,173 |  |  | $ | 29.52 |
Granted | 110,923 |  |  | 29.48 |  |  | 165,350 |  |  | 29.08 |
Performance condition adjustment, net (a) | 1,443 |  |  | 43.05 |  |  | — |  |  | — |
Vested | (212,891 | ) |  | 19.45 |  |  | (182,857 | ) |  | 26.42 |
Forfeited | (10,512 | ) |  | 37.99 |  |  | (5,561 | ) |  | 35.96 |
Outstanding, March 31, 2019 | 318,751 |  |  | $ | 31.13 |  |  | 266,105 |  |  | $ | 31.24 |
_______________________________
(a) | Represents additional PSUs granted to non-officers based on achievement of 2018 EBITDA in excess of target.
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 March 31
| 2019 |  | 2018
| (thousands)
PSUs | $ | 979 |  |  | $ | 1,087 |
RSUs | 1,221 |  |  | 1,199 |
Total | $ | 2,200 |  |  | $ | 2,286 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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