Income Taxes - Schedule of Differences in Federal Income Tax Expense and State Tax Expense from Statutory Federal and State Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Federal taxes calculated at statutory rate	$ 5,061
Increase (decrease) resulting from:
State taxes, net of federal benefit	3,664	$ 2,956	$ 2,258
Conversion as of September 16, 2016 to C Corporation	13,181
Other	(173)	12	11
Total	21,733	$ 2,968	$ 2,269
C Corporation
Increase (decrease) resulting from:
Conversion as of September 16, 2016 to C Corporation	$ 13,181