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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 stock_awards | Feb. 28, 2018 stock_awards | Mar. 31, 2019 USD ($) tranch $ / shares shares | Mar. 31, 2018 USD ($) shares | Dec. 31, 2018 $ / 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 | $ 15,200 |
Stock-based compensation expense | $ |  |  |  | 2,200 | 2,286 |
Tax benefit from compensation expense | $ |  |  |  | 600 | 600 |
Unrecognized compensation expense | $ |  |  |  | $ 13,700 |  |
Unrecognized compensation, period for recognition |  |  |  | 2 years 1 month |  |
Performance Shares [Member] |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 979 | $ 1,087 |
Number of shares [Abstract] |  |  |  |  |  |
Outstanding, December 31, 2018 | shares |  |  |  | 429,788 |  |
Granted | shares |  |  |  | 110,923 | 78,976 |
Performance condition adjustment, net (a) | shares | [1] |  |  | 1,443 |  |
Vested | shares |  |  |  | (212,891) |  |
Forfeited | shares |  |  |  | (10,512) |  |
Outstanding, March 31, 2019 | shares |  |  |  | 318,751 |  | 429,788
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |
Outstanding, December 31, 2018 | $ / shares |  |  |  | $ 25.90 |  |
Granted | $ / shares |  |  |  | 29.48 |  |
Performance condition adjustment, net (a) | $ / shares | [1] |  |  | 43.05 |  |
Vested | $ / shares |  |  |  | 19.45 |  |
Forfeited | $ / shares |  |  |  | 37.99 |  |
Outstanding, March 31, 2019 | $ / shares |  |  |  | $ 31.13 |  | $ 25.90
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Stock-Based Compensation [Abstract] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 1,221 | $ 1,199 |
Number of shares [Abstract] |  |  |  |  |  |
Outstanding, December 31, 2018 | shares |  |  |  | 289,173 |  |
Granted | shares |  |  |  | 165,350 | 98,375 |
Performance condition adjustment, net (a) | shares |  |  |  | 0 |  |
Vested | shares |  |  |  | (182,857) |  |
Forfeited | shares |  |  |  | (5,561) |  |
Outstanding, March 31, 2019 | shares |  |  |  | 266,105 |  | 289,173
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |
Outstanding, December 31, 2018 | $ / shares |  |  |  | $ 29.52 |  |
Granted | $ / shares |  |  |  | 29.08 |  |
Performance condition adjustment, net (a) | $ / shares |  |  |  | 0.00 |  |
Vested | $ / shares |  |  |  | 26.42 |  |
Forfeited | $ / shares |  |  |  | 35.96 |  |
Outstanding, March 31, 2019 | $ / shares |  |  |  | $ 31.24 |  | $ 29.52
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% |  |
Vesting period (in years) |  |  |  | 3 years |  |
Performance Shares Target Percentage Earned, Officers |  |  |  |  |  | 100.00%
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% |  |
Number of equal tranches for annual vesting (in tranches) | tranch |  |  |  | 3 |  |
Performance Shares Target Percentage Earned, Other Employees |  |  |  |  |  | 110.00%
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 additional PSUs granted to non-officers based on achievement of 2018 EBITDA in excess of target.

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- Definition The weighted average fair value of non-vested performance true-up awards on equity-based plans excluding options plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: 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)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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