Equity Transactions (Common Stock) (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock, Outstanding [Roll Forward]
Shares of common stock outstanding, beginning (in shares)	59,945,893	61,908,979	52,417,812
Issuance of shares of common stock for TWG acquisition (in shares)	0	0	10,399,862
Vested restricted stock and restricted stock units, net (in shares)	213,569	248,333	170,426
Issuance related to performance share units (in shares)	157,155	117,581	110,137
Issuance related to ESPP (in shares)	90,166	88,498	80,425
Shares of common stock repurchased (in shares)	(2,438,975)	(2,417,498)	(1,269,683)
Shares of common stock outstanding, ending (in shares)	57,967,808	59,945,893	61,908,979
Shares authorized (in shares)	800,000,000	800,000,000
Common Class B
Common Stock, Outstanding [Roll Forward]
Shares authorized (in shares)	150,001
Common Class C
Common Stock, Outstanding [Roll Forward]
Shares authorized (in shares)	400,001