Share-Based Payments (Details Textual)
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9 Months Ended | |||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Share-Based Payments (Textual) [Abstract] | ||||||||||
Shares issued under ESPP | 225,000 | 382,000 | ||||||||
Number of stock option | 0 | 0 | ||||||||
Market stock units [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 312,000 | [1] | 393,000 | [1] | ||||||
Market stock units [Member] | Attainment of Performance Criteria [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 39,000 | |||||||||
Market stock units [Member] | Attainment Of Performance Criteria Set for 2010 [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 41,000 | 26,000 | ||||||||
Cash settled performance shares [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 327,000 | [2] | 490,000 | [2] | ||||||
Cash settled performance shares [Member] | Attainment of Performance Criteria [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 68,000 | |||||||||
Cash settled performance shares [Member] | Attainment Of Performance Criteria Set for 2010 [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 95,000 | |||||||||
Performance vested restricted stock units [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 0 | [3] | 1,000 | [3] | ||||||
Restricted Stock Units (RSUs) [Member] | Director [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||
Units granted in connection with annual awards | 24,000 | 35,000 | ||||||||
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