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Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Weighted Average Remaining Contractual Life - Years | 4 years 10 months 2 days | 5 years 8 months 8 days |
Number of options outstanding | 1,639,842 | 1,674,065 | 1,772,348
Weighted Average Exercise Price Stock Options Outstanding | $ 11.46 | $ 11.37 | $ 11.81
Number of Awards Vested | 1,523,536 | 1,345,541 |
Weighted Average Exercise Price | $ 11.82 | $ 12.62 |
Weighted Average Remaining Contractual Life of Stock Options Vested | 4 years 7 months 13 days | 5 years 1 month 2 days |
Range 1 [Member] |  |  |
Exercise price lower range limit | $ 4.50 | $ 4.50 |
Exercise price upper range limit | $ 8.70 | $ 8.70 |
Weighted Average Remaining Contractual Life - Years | 6 years 3 months 7 days | 7 years 25 days |
Number of options outstanding | 844,801 | 871,195 |
Weighted Average Exercise Price Stock Options Outstanding | $ 6.33 | $ 6.38 |
Number of Awards Vested | 728,495 | 542,671 |
Weighted Average Exercise Price | $ 6.27 | $ 6.48 |
Weighted Average Remaining Contractual Life of Stock Options Vested | 6 years 14 days | 6 years 5 months 8 days |
Range 2 [Member] |  |  |
Exercise price lower range limit | $ 9 | $ 9 |
Exercise price upper range limit | $ 12.90 | $ 12.90 |
Weighted Average Remaining Contractual Life - Years | 4 years 11 months 8 days | 5 years 29 days |
Number of options outstanding | 130,037 | 152.34 |
Weighted Average Exercise Price Stock Options Outstanding | $ 10.46 | $ 10.51 |
Number of Awards Vested | 130,037 | 152,340 |
Weighted Average Exercise Price | $ 10.46 | $ 10.51 |
Weighted Average Remaining Contractual Life of Stock Options Vested | 4 years 11 months 8 days | 5 years 29 days |
Range 3 [Member] |  |  |
Exercise price lower range limit | $ 13.50 | $ 13.50 |
Exercise price upper range limit | $ 18.90 | $ 18.90 |
Weighted Average Remaining Contractual Life - Years | 3 years 3 months 18 days | 4 years 3 months 4 days |
Number of options outstanding | 358,336 | 343,862 |
Weighted Average Exercise Price Stock Options Outstanding | $ 14.17 | $ 14.14 |
Number of Awards Vested | 358,336 | 343,862 |
Weighted Average Exercise Price | $ 14.17 | $ 14.14 |
Weighted Average Remaining Contractual Life of Stock Options Vested | 3 years 3 months 18 days | 4 years 3 months 4 days |
Range 4 [Member] |  |  |
Exercise price lower range limit | $ 19.20 | $ 19.20 |
Exercise price upper range limit | $ 23.85 | $ 23.85 |
Weighted Average Remaining Contractual Life - Years | 2 years 7 months 24 days | 3 years 7 months 24 days |
Number of options outstanding | 306,668 | 306,668 |
Weighted Average Exercise Price Stock Options Outstanding | $ 22.84 | $ 22.84 |
Number of Awards Vested | 306,668 | 306,668 |
Weighted Average Exercise Price | $ 22.84 | $ 22.84 |
Weighted Average Remaining Contractual Life of Stock Options Vested | 2 years 7 months 24 days | 3 years 7 months 24 days |

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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + 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)(b) -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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -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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- Definition As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) -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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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option 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 (e)(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 d(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. + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, 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 + Details
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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 + Details
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