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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions															12 Months Ended
	Feb. 26, 2019	Nov. 02, 2018	Aug. 03, 2018	Aug. 02, 2018	May 04, 2018	Feb. 21, 2018	Nov. 02, 2017	Aug. 02, 2017	May 05, 2017	Feb. 21, 2017	Nov. 02, 2016	Aug. 03, 2016	May 02, 2016	Feb. 22, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Dividend
Cash dividend declared (in dollars per share)		$ 0.060		$ 0.060	$ 0.060	$ 0.060	$ 0.060	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.055	$ 0.240	$ 0.225	$ 0.220
Credit Agreement
Credit Agreement
Potential increase per the accordion feature			$ 75.0
Term Loan
Credit Agreement
Principal amount			$ 220.0
Term Loan | First Three Years
Credit Agreement
Number of years payments are to be made			3 years
Subsequent Events
Cash Dividend
Cash dividend declared (in dollars per share)	$ 0.06

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face (par) amount of debt instrument at time of issuance.

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