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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
		Feb. 28, 2019 stock_awards	Feb. 28, 2018 stock_awards	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) tranch $ / shares shares	Sep. 30, 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 | $						$ 11,400	$ 15,400
Stock-based compensation expense | $				$ 1,947	$ 2,162	6,016	6,893
Tax benefit from compensation expense | $						1,500	1,700
Unrecognized compensation expense | $				9,100		$ 9,100
Unrecognized compensation, period for recognition						1 year 9 months 18 days
Performance Shares [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 800	945	$ 2,515	$ 3,263
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						(223,840)
Forfeited | shares						(19,813)
Outstanding, September 30, 2019 | shares				298,501		298,501		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						19.97
Forfeited | $ / shares						35.85
Outstanding, September 30, 2019 | $ / shares				$ 31.09		$ 31.09		$ 25.90
Restricted Stock Units (RSUs) [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense | $				$ 1,147	$ 1,217	$ 3,501	$ 3,630
Number of shares [Abstract]
Outstanding, December 31, 2018 | shares						289,173
Granted | shares						166,675	99,087
Performance condition adjustment, net (a) | shares						0
Vested | shares						(183,403)
Forfeited | shares						(13,321)
Outstanding, September 30, 2019 | shares				259,124		259,124		289,173
Weighted Average Grant Date Fair Value [Abstract]
Outstanding, December 31, 2018 | $ / shares						$ 29.52
Granted | $ / shares						29.06
Performance condition adjustment, net (a) | $ / shares						0
Vested | $ / shares						26.44
Forfeited | $ / shares						35.23
Outstanding, September 30, 2019 | $ / shares				$ 31.11		$ 31.11		$ 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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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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