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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity [Abstract] |
Summary of Stock option activity |
|  | Number of Shares |  |  | Weighted - Average Exercise Price Per Share |  |  | Weighted - Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2011 |  |  | 2,130 |  |  | $ | 27.46 |  |  |  |  |  |  |  |  |
Granted |  |  | 422 |  |  |  | 33.25 |  |  |  |  |  |  |  |  |
Exercised |  |  | (435 | ) |  |  | 24.47 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (181 | ) |  |  | 31.44 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 1,936 |  |  | $ | 29.03 |  |  |  | 6.37 |  |  | $ | 2,319 |
Vested and expected to vest at December 31, 2012 |  |  | 1,859 |  |  | $ | 28.86 |  |  |  | 6.27 |  |  | $ | 2,316 |
Exercisable at December 31, 2012 |  |  | 1,096 |  |  | $ | 26.48 |  |  |  | 4.73 |  |  | $ | 2,151 |
Details of Restricted Stock Units (RSU) activity |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |
Unvested at December 31, 2011 |  |  | 267 |  |  | $ | 29.93 |
Granted |  |  | 179 |  |  |  | 33.88 |
Vested or settled |  |  | (49 | ) |  |  | 27.60 |
Forfeited |  |  | (96 | ) |  |  | 28.90 |
Unvested at December 31, 2012 |  |  | 301 |  |  | $ | 32.98 |
Summary of Shares purchased by employees under the Stock Purchase Plan |
|  | Shares |  |  | Purchase |
Purchase Period Ended |  | Purchased |  |  | Price |
August 31, 2012 |  |  | 23 |  |  | $ | 24.88 |
June 30, 2011 |  |  | 51 |  |  | $ | 28.02 |
December 31, 2011 |  |  | 50 |  |  | $ | 28.08 |
June 30, 2010 |  |  | 45 |  |  | $ | 22.67 |
December 31, 2010 |  |  | 44 |  |  | $ | 26.44 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + 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 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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