Credit Arrangements, Stock Buy-Back Program (Details) $ in Millions		12 Months Ended
Jul. 22, 2016 USD ($) Loans shares	Dec. 31, 2017 shares
Stock Repurchase Program [Abstract]
% of shares owned by shareholder	8.00%
Treasury stock shares acquired (in shares) \| shares	300,000	1,089,184
Number of promissory notes issued \| Loans	2
Interest rate	0.00%
Stock Buy-Back Program [Member]
Stock Repurchase Program [Abstract]
% of shares owned by shareholder	8.00%
Stock Buy-Back Program [Member] \| Promissory Notes [Member]
Stock Repurchase Program [Abstract]
Amount paid to repurchase shares during the year \| $	$ 2.9
Stock Buy-Back Program [Member] \| Promissory Notes [Member] \| First Half of Note Value [Member]
Stock Repurchase Program [Abstract]
Term of debt		1 year
Stock Buy-Back Program [Member] \| Promissory Notes [Member] \| Second Half of Note Value [Member]
Stock Repurchase Program [Abstract]
Term of debt		2 years

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Represents the number of promissory notes issued.

+ References

No definition available.

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- Definition

Percent of the shares of the entity owned by a shareholder.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

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