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Stock-Based Compensation Stock Based Compensation (RSU) Details 2 (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | |
| RSUs granted | 942,856 |
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Restricted Stock Units (RSUs) [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] | |
| Shares Outstanding, Beginning of Period | 574,350 |
| RSUs granted | 942,856 |
| RSUs forfeited | (4,278) |
| Shares Outstanding, End of Period | 1,512,928 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Exercise Price [Roll Forward] | |
| Weighted Average Fair Value, Beginning of Period, USD per share | $ 64.06 |
| Weighted Average Fair Value, RSUs granted, USD per share | $ 97.64 |
| Weighted Average Fair Value, RSUs forfeited, USD per share | $ 75.03 |
| Weighted Average Fair Value, End of Period, USD per share | $ 84.95 |