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Common Stock (Details) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2009	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2008
Common Stock [Abstract]
Common stock authorized by the Board of Directors (in shares)	1,200,000			2,250,000
Maximum percentage of repurchase of common stock	10.00%
Bank credit agreement to permit share repurchases of common stock	$ 15,000,000
Total purchased shares (in shares)	859,499	0	0
Additional estimated shares (in shares)	279,433
Closing price (in dollars per share)		$ 53.68

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- Definition

Per share or per unit amount of equity securities issued.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Additional estimated repurchase of common stock during the period.

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- Definition

Bank credit agreement to permit share repurchases of common stock during the period.

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- Definition

Maximum percentage of repurchase of common stock during the period.

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