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Stock-Based Compensation (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock options outstanding (in shares)	143,224	216,859	298,740	759,683
Outstanding options, weighted-average exercise price (in dollars per share)	$ 9.13	$ 8.80	$ 9.97	$ 11.36
Outstanding options, weighted-average remaining contractual life (Year)	1 year 3 months 14 days
Stock options exercisable (in shares)	102,616
Exercisable options, weighted-average exercise price (in dollars per share)	$ 8.33
Range 1 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	5.76
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 10.72
Stock options outstanding (in shares)	99,975
Outstanding options, weighted-average exercise price (in dollars per share)	$ 5.76
Outstanding options, weighted-average remaining contractual life (Year)	1 year 6 days
Stock options exercisable (in shares)	65,277
Exercisable options, weighted-average exercise price (in dollars per share)	$ 5.76
Range 2 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	10.73
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 11.40
Stock options outstanding (in shares)	35,339
Outstanding options, weighted-average exercise price (in dollars per share)	$ 10.84
Outstanding options, weighted-average remaining contractual life (Year)	7 months 6 days
Stock options exercisable (in shares)	35,339
Exercisable options, weighted-average exercise price (in dollars per share)	$ 10.84
Range 3 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	11.41
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 24.86
Stock options outstanding (in shares)	1,160
Outstanding options, weighted-average exercise price (in dollars per share)	$ 22.11
Outstanding options, weighted-average remaining contractual life (Year)	5 years 3 months 4 days
Range 4 [Member]
Outstanding options, exercise price range, lower limit (in dollars per share)	$ 24.87
Outstanding options, exercise price range, upper limit (in dollars per share)	$ 49.91
Stock options outstanding (in shares)	6,750
Outstanding options, weighted-average exercise price (in dollars per share)	$ 47.83
Outstanding options, weighted-average remaining contractual life (Year)	8 years 1 month 13 days
Stock options exercisable (in shares)	2,000
Exercisable options, weighted-average exercise price (in dollars per share)	$ 47.62

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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