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Stock-Based Compensation (Details Textual) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2012
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Jun. 30, 2012
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Jun. 30, 2011
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| Stock-Based Compensation (Textual) [Abstract] |
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| Forfeiture rate increased to reduce stock-based compensation expense |
$ 724,000,000 |
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| Stock options granted, weighted average exercise price |
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$ 20.75 |
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Stock Options [Member]
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| Stock-Based Compensation (Textual) [Abstract] |
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| Stock based compensation program grant stock based awards |
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12,120,000 |
| Shares available for future issuance |
6,999,215 |
6,999,215 |
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| Stock-based compensation expense, related to restricted stock awards |
295,000,000 |
737,000,000 |
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| Unrecognized compensation costs, net of forfeitures, related to non-vested stock option awards |
$ 26,700,000 |
$ 26,700,000 |
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| Stock options granted |
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320,000 |
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| Stock options granted, weighted average exercise price |
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$ 20.75 |
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| Stock options, contractual term |
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7 years |
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| Stock options vested |
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1.1 |
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| Aggregate intrinsic value of stock options outstanding |
$ 18.39 |
$ 18.39 |
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| Recognized weighted average period related to non-vested stock option awards |
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3 years 11 days |
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