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Stock-Based Compensation (Details 2) (USD $) | 3 Months Ended
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Mar. 31, 2013
Summary of changes in unvested options |
Weighted-average exercise price per share, Beginning balance | $ 19.59
Weighted-average exercise price per share, Granted |
Weighted-average exercise price per share, Ending balance | $ 19.70
Unvested stock options [Member] |
Summary of changes in unvested options |
Number of options, Beginning balance | 64,503
Number of options, Granted |
Number of options, Vested | (13,037)
Number of options, Cancelled |
Number of options, Ending balance | 51,466
Weighted-average exercise price per share, Beginning balance | $ 10.86
Weighted-average exercise price per share, Granted |
Weighted-average exercise price per share, Vested | $ 11.86
Weighted-average exercise price per share, Cancelled |
Weighted-average exercise price per share, Ending balance | $ 10.61
Weighted-average grant date fair value per option, Beginning balance | $ 8.67
Weighted-Average Grant Date Fair Value per option, Granted |
Weighted-Average Grant Date Fair Value per option, Vested | $ 9.54
Weighted-Average Grant Date Fair Value per option, Cancelled |
Weighted-average grant date fair Value per option, Ending balance | $ 8.45

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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