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Compensation Plans - Summary of Deferred Compensation Expense Recognition (Details) - Restricted Stock Units (RSUs)	Dec. 31, 2017 USD ($)
Expense recognition of deferred compensation
2018	$ 6,098,558
2019	5,362,104
2020	3,689,576
2021	2,209,739
2022	1,176,507
Thereafter	598,479
Total	$ 19,134,963

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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=96867065&loc=d3e5070-113901

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