Stock Based Compensation, Stock Options Outstanding By Exercise Price Range (Details) (USD $)	3 Months Ended
Mar. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding stock options, number (in shares)	99,810
Outstanding stock option, weighted average exercise price (in dollars per share)	$ 12.16
Outstanding stock option, weighted average remaining contractual life	5 years 4 months 24 days
Exercisable stock options, number (in shares)	78,705
Exercisable stock option, weighted average exercise price (in dollars per shares)	$ 12.17
Exercisable stock options, weighted average remaining contractual life	5 years
$9.00 - $10.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 9.00
Exercise price range, upper range limit (in dollars per share)	$ 10.99
Outstanding stock options, number (in shares)	23,494
Outstanding stock option, weighted average exercise price (in dollars per share)	$ 9.00
Outstanding stock option, weighted average remaining contractual life	4 years 9 months 18 days
Exercisable stock options, number (in shares)	23,494
Exercisable stock option, weighted average exercise price (in dollars per shares)	$ 9.00
Exercisable stock options, weighted average remaining contractual life	4 years 9 months 18 days
$11.00 - $12.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 11.00
Exercise price range, upper range limit (in dollars per share)	$ 12.99
Outstanding stock options, number (in shares)	63,354
Outstanding stock option, weighted average exercise price (in dollars per share)	$ 12.05
Outstanding stock option, weighted average remaining contractual life	6 years 3 months 18 days
Exercisable stock options, number (in shares)	42,249
Exercisable stock option, weighted average exercise price (in dollars per shares)	$ 12.02
Exercisable stock options, weighted average remaining contractual life	5 years 10 months 24 days
$17.00 - $18.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 17.00
Exercise price range, upper range limit (in dollars per share)	$ 18.99
Outstanding stock options, number (in shares)	12,962
Outstanding stock option, weighted average exercise price (in dollars per share)	$ 18.41
Outstanding stock option, weighted average remaining contractual life	2 years 4 months 24 days
Exercisable stock options, number (in shares)	12,962
Exercisable stock option, weighted average exercise price (in dollars per shares)	$ 18.41
Exercisable stock options, weighted average remaining contractual life	2 years 4 months 24 days

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

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=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of exercisable stock options, 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)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, 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=6415400&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=6415400&loc=d3e5070-113901

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