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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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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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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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