Non-controlling Interest - Narrative (Details) - USD ($) $ in Thousands, shares in Millions		1 Months Ended	2 Months Ended	12 Months Ended
	Jan. 01, 2018	Oct. 31, 2013	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Minority Interest						5.2
Common stock issued at initial public offering						5.2
Deferred tax assets, net				$ 59,151	$ 105,770
Corporate tax rate				35.00%	35.00%	35.00%
Forecast
Significant Accounting Policies [Line Items]
Corporate tax rate	21.00%
RIHI
Significant Accounting Policies [Line Items]
Common stock issued at initial public offering		11.6	5.2
RIHI and Oberndorf Investments LLC
Significant Accounting Policies [Line Items]
Tax benefit realized				85.00%
RMCO, LLC | RIHI
Significant Accounting Policies [Line Items]
Deferred tax assets and liability				$ 53,200