Earnings Per Share - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term equity-based compensation expense		$ 19,654
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated vesting of equity instruments (in shares)	473,126
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated vesting of equity instruments (in shares)	903,100
Southeastern Asset Management, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage in equity method investment		25.00%