Average Shares Outstanding (Details) - USD ($) shares in Thousands, $ in Thousands			3 Months Ended	6 Months Ended
Apr. 06, 2018	Apr. 17, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Average Shares Outstanding
Stock purchases (in shares)					472	536
Purchase of common shares					$ 15,803	$ 20,140
Stock dividends (as a percent)			3.00%	3.00%	3.00%	3.00%
Stock dividend shares distributed	1,869	1,847

No definition available.

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- Definition

The dividend rate applied to calculate stock dividends distributed.

+ References

No definition available.

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- Definition

Number of shares of common stock issued as dividends during the period. Excludes stock splits.

+ References

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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