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Compensation Plans - Summary of Deferred Compensation Expense Recognition (Details) - Restricted Stock Units (RSUs)	Dec. 31, 2018 USD ($)
Expense recognition of deferred compensation
2019	$ 7,135,131
2020	5,671,192
2021	4,358,633
2022	3,371,500
2023	1,129,611
Thereafter	341,987
Total	$ 22,008,054

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Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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