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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) $ / shares shares | Mar. 31, 2020 stock_awards $ / shares shares | Jun. 30, 2019 USD ($) | Mar. 31, 2019 stock_awards | Jun. 30, 2020 USD ($) tranch $ / shares shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019 $ / shares shares
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Number of types of stock-based awards granted (in types) | stock_awards |  |  | 2 |  | 2 |  |  |
Fair market value of awards | $ |  |  |  |  |  | $ 11,100 | $ 11,400 |
Stock-based compensation expense | $ |  | $ 1,671 |  | $ 1,869 |  | 3,345 | 4,069 |
Tax benefit from compensation expense | $ |  |  |  |  |  | 800 | 1,000 |
Unrecognized compensation expense | $ |  | 9,800 |  |  |  | $ 9,800 |  |
Unrecognized compensation, period for recognition |  |  |  |  |  | 2 years |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  | $ 691 |  | 736 |  | $ 1,301 | $ 1,715 |
Number of shares [Abstract] |  |  |  |  |  |  |  |
Outstanding, December 31, 2019 | shares |  |  | 295,347 |  |  | 295,347 |  |
Granted | shares |  |  |  |  |  | 94,850 | 110,923 |
Performance condition adjustment (a) | shares | [1] |  |  |  |  | (6,989) |  |
Vested | shares |  |  |  |  |  | (162,622) |  |
Forfeited | shares |  |  |  |  |  | (24,246) |  |
Outstanding, June 30, 2020 | shares |  | 196,340 |  |  |  | 196,340 |  | 295,347
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |
Outstanding, December 31, 2019 | $ / shares |  |  | $ 31.09 |  |  | $ 31.09 |  |
Granted | $ / shares |  |  |  |  |  | 36.45 |  |
Performance condition adjustment (a) | $ / shares | [1] |  |  |  |  | 29.48 |  |
Vested | $ / shares |  |  |  |  |  | 28.93 |  |
Forfeited | $ / shares |  |  |  |  |  | 32.57 |  |
Outstanding, June 30, 2020 | $ / shares |  | $ 35.34 |  |  |  | $ 35.34 |  | $ 31.09
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  | $ 980 |  | $ 1,133 |  | $ 2,044 | $ 2,354 |
Number of shares [Abstract] |  |  |  |  |  |  |  |
Outstanding, December 31, 2019 | shares |  |  | 257,564 |  |  | 257,564 |  |
Granted | shares |  |  |  |  |  | 125,716 | 166,180 |
Performance condition adjustment (a) | shares | [1] |  |  |  |  | 0 |  |
Vested | shares |  |  |  |  |  | (143,807) |  |
Forfeited | shares |  |  |  |  |  | (26,707) |  |
Outstanding, June 30, 2020 | shares |  | 212,766 |  |  |  | 212,766 |  | 257,564
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |
Outstanding, December 31, 2019 | $ / shares |  |  | $ 31.14 |  |  | $ 31.14 |  |
Granted | $ / shares |  |  |  |  |  | 36.45 |  |
Performance condition adjustment (a) | $ / shares | [1] |  |  |  |  | 0 |  |
Vested | $ / shares |  |  |  |  |  | 30.88 |  |
Forfeited | $ / shares |  |  |  |  |  | 32.82 |  |
Outstanding, June 30, 2020 | $ / shares |  | $ 34.24 |  |  |  | $ 34.24 |  | $ 31.14
Officer [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Performance Shares that could be awarded, as a percentage of ROIC target amount, minimum |  |  |  |  |  | 0.00% |  |
Performance Shares that could be awarded, as a percentage of ROIC target amount, maximum |  |  |  |  |  | 200.00% |  |
Performance Shares Target Percentage Earned, Officers |  |  |  |  |  |  |  | 93.00%
Vesting period (in years) |  |  |  |  |  | 3 years |  |
Other employees [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Performance Shares that could be awarded, as a percentage of EBITDA target amount, minimum |  |  |  |  |  | 0.00% |  |
Performance Shares that could be awarded, as a percentage of EBITDA target amount, maximum |  |  |  |  |  | 200.00% |  |
Performance Shares Target Percentage Earned, Other Employees |  |  |  |  |  |  |  | 96.00%
Number of equal tranches for annual vesting (in tranches) | tranch |  |  |  |  |  | 3 |  |
Officers and other employees [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Number of equal tranches for annual vesting (in tranches) | tranch |  |  |  |  |  | 3 |  |
Nonemployee Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 1 year |  |
[1] | Represents total PSUs forfeited during the six months ended June 30, 2020 related to the 2019 performance condition adjustment described above.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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