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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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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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Unrecognized cost of unvested share-based compensation awards.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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