Common Stock (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Member Units | Bold Contribution Agreement
Capital Unit [Line Items]
Stock conversion (in shares)			1
Class A Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)	30,020,357		30,020,357		29,421,131
Common stock, shares outstanding (in shares)	30,020,357		30,020,357		29,421,131
Class A Common Stock | Bold Contribution Agreement
Capital Unit [Line Items]
Stock conversion (in shares)			1
Class A Common Stock | 2014 Plan
Capital Unit [Line Items]
Common shares issued during period under stock plan (in shares)	223,209	176,655	530,738	402,056
Common stock repurchased (in shares)	57,810	43,344	133,505	102,605
Class B Common Stock
Capital Unit [Line Items]
Common stock, shares issued (in shares)	35,058,687		35,058,687		35,260,680
Common stock, shares outstanding (in shares)	35,058,687		35,058,687		35,260,680
EEH units and class B common stock converted to class A common stock (in shares)	2,000	35,732	201,993	35,732