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Stock-based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012
Stock options outstanding and exercisable
Outstanding number of Options	144,019
Outstanding, Average Life	4 years 10 months 28 days
Outstanding Average Exercise Price	$ 18.28
Exercisable number of Options	125,666
Exercisable, Weighted Average Exercise Price	$ 18.77
$0.36-$3.60 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 0.36
Price Range, Maximum	$ 3.60
Outstanding number of Options	1,248
Outstanding, Average Life	2 years 5 months 1 day
Outstanding Average Exercise Price	$ 3.13
Exercisable number of Options	1,248
Exercisable, Weighted Average Exercise Price	$ 3.13
$5.40-$5.40 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 5.40
Price Range, Maximum	$ 5.40
Outstanding number of Options	33,844
Outstanding, Average Life	1 year 2 months 12 days
Outstanding Average Exercise Price	$ 5.40
Exercisable number of Options	33,844
Exercisable, Weighted Average Exercise Price	$ 5.40
$6.00-$11.16 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 6.00
Price Range, Maximum	$ 11.16
Outstanding number of Options	22,078
Outstanding, Average Life	5 years 2 months 9 days
Outstanding Average Exercise Price	$ 9.73
Exercisable number of Options	21,883
Exercisable, Weighted Average Exercise Price	$ 9.76
$13.44-$13.44 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 13.44
Price Range, Maximum	$ 13.44
Outstanding number of Options	25,363
Outstanding, Average Life	7 years 10 months 13 days
Outstanding Average Exercise Price	$ 13.44
Exercisable number of Options	14,115
Exercisable, Weighted Average Exercise Price	$ 13.44
$16.14-$17.40 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 16.14
Price Range, Maximum	$ 17.40
Outstanding number of Options	26,354
Outstanding, Average Life	5 years 10 months 28 days
Outstanding Average Exercise Price	$ 16.96
Exercisable number of Options	20,386
Exercisable, Weighted Average Exercise Price	$ 17.09
$17.82-$33.42 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 17.82
Price Range, Maximum	$ 33.42
Outstanding number of Options	34,570
Outstanding, Average Life	5 years 6 months 18 days
Outstanding Average Exercise Price	$ 27.85
Exercisable number of Options	33,628
Exercisable, Weighted Average Exercise Price	$ 27.95
$87.47-$1908.00 [Member]
Stock options outstanding and exercisable
Price Range, Minimum	$ 87.47
Price Range, Maximum	$ 1,908.00
Outstanding number of Options	562
Outstanding, Average Life	3 years 5 months 5 days
Outstanding Average Exercise Price	$ 856.14
Exercisable number of Options	562
Exercisable, Weighted Average Exercise Price	$ 856.14

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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=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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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)(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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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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)

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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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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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