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Summary of Significant Accounting Policies (Details 2)
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3 Months Ended |
|---|---|
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Mar. 31, 2014
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Minimum
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| Revenue Recognition and Deferred Revenue | |
| Period to derive revenue under long-term contracts | 10 years |
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Maximum
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| Revenue Recognition and Deferred Revenue | |
| Period to derive revenue under long-term contracts | 15 years |