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Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of changes in unvested options
Weighted-Average Grant Date Fair Value per option, Granted	$ 0.00	$ 5.31	$ 8.40
Unvested stock options [Member]
Summary of changes in unvested options
Number of options, Beginning balance	152,192
Number of options, Granted
Number of options, Vested	(63,911)
Number of options, Cancelled	(23,778)
Number of options, Ending balance	64,503
Weighted-average grant date fair value per option, Beginning balance	$ 9.43
Weighted-Average Grant Date Fair Value per option, Granted
Weighted-Average Grant Date Fair Value per option, Vested	$ 9.81
Weighted-Average Grant Date Fair Value per option, Cancelled	$ 10.46
Weighted-average grant date fair Value per option, Ending balance	$ 8.67

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1)

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



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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