Organization and Description of the Business (Details) - USD ($)											12 Months Ended
	Feb. 25, 2019	Nov. 19, 2018	Nov. 17, 2017	Nov. 10, 2017	May 19, 2017	May 12, 2017	Mar. 25, 2017	Dec. 16, 2016	Jun. 22, 2015	Oct. 15, 2014	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 18, 2018	Feb. 03, 2016
Organization and description of the business
Repurchase of common stock (in shares)					5,000,000			6,000,000			19,479,945	5,549,861	0
Average price of common stock repurchased (in dollars per share)											$ 12.08	$ 13.35
Stock repurchased, net of commissions											$ 235,400,000
Stock repurchase program, authorized amount														$ 600,000,000	$ 150,000,000
Price per share of shares repurchased (in dollars per share)					$ 14.55			$ 14.25
Repurchase of ordinary shares											$ 236,500,000	$ 74,600,000	$ 73,100,000
Parent Company
Organization and description of the business
Percent of interest sold							24.95%
HNA Capital US
Organization and description of the business
Percent ownership after sale of stock transaction	0.00%	21.40%	24.95%	24.95%	0.00%	9.95%		0.00%	0.00%	0.00%
Paulson
Organization and description of the business
Percent ownership after sale of stock transaction	21.70%	4.90%	0.00%	0.00%	0.00%	0.00%		0.00%	0.00%	0.00%