Supplemental Information to Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 845,882	$ 425,384	$ 320,147
Restricted cash reserves	48,610	78,113	64,695
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	894,492	503,497	$ 384,842	$ 659,076
Interest paid	63,586	84,377
Income taxes paid	2,520	1,902
Operating Lease, Payments	11,505
In connection with the sale of hotel properties, the Company recorded the following:
Sale of hotel properties	640,681	456,600
Transaction costs	(9,224)	(8,432)
Operating prorations	(7,882)	(431)
Proceeds from the sale of hotel properties, net	623,575	447,737
Supplemental non-cash transactions
Accrued capital expenditures	$ 6,857	$ 5,879