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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		12 Months Ended
		Feb. 29, 2020 stock_awards	Feb. 28, 2019 stock_awards	Mar. 31, 2020 USD ($) tranch $ / shares shares	Mar. 31, 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	$ 11,100
Stock-based compensation expense | $				1,674	2,200
Tax benefit from compensation expense | $				400	600
Unrecognized compensation expense | $				$ 8,500
Unrecognized compensation, period for recognition				2 years 1 month 6 days
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 610	$ 979
Number of shares [Abstract]
Outstanding, December 31, 2019 | shares				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, March 31, 2020 | shares				196,340		295,347
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2019 | $ / shares				$ 31.09
Granted | $ / shares				36.45
Performance condition adjustment (a) | $ / shares	[1]			29.48
Vested | $ / shares				28.93
Forfeited | $ / shares				32.57
Outstanding, March 31, 2020 | $ / shares				$ 35.34		$ 31.09
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,064	$ 1,221
Number of shares [Abstract]
Outstanding, December 31, 2019 | shares				257,564
Granted | shares				125,716	165,350
Performance condition adjustment (a) | shares				0
Vested | shares				(143,807)
Forfeited | shares				(26,707)
Outstanding, March 31, 2020 | shares				212,766		257,564
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2019 | $ / shares				$ 31.14
Granted | $ / shares				36.45
Performance condition adjustment (a) | $ / shares				0
Vested | $ / shares				30.88
Forfeited | $ / shares				32.82
Outstanding, March 31, 2020 | $ / shares				$ 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 three months ended March 31, 2020 related to the 2019 performance condition adjustment described above.

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The company's EBITDA exceed the performance target, thus participants earned a true-up related to their performance stock unit shares.

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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.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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