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Stock-Based Compensation - Summary of Deferred Compensation Expense Recognition (Details) (Restricted Stock Units (RSUs), USD $)	Dec. 31, 2013
Restricted Stock Units (RSUs)
Expense recognition of deferred compensation
2014	$ 4,647,324
2015	3,588,155
2016	1,641,218
2017	1,024,797
2018	261,197
Total	$ 11,162,691

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- Definition

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+ References

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- Definition

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- Definition

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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