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Common Stock (Details) - USD ($)			3 Months Ended								12 Months Ended
	Jan. 29, 2019	Dec. 19, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Dividends declared (in dollars per share)		$ 0.12	$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Dividends paid (in dollars per share)											$ 0.44	$ 0.40	$ 0.36
Stock repurchase program, authorized amount			$ 30,000,000								$ 30,000,000
Subsequent Event
Class of Stock [Line Items]
Dividends paid (in dollars per share)	$ 0.12

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of stock repurchase plan authorized.

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