Basis Of Presentation Basis Of Presentation (Schedule of ASU 610-20) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in Unconsolidated Joint Ventures	$ 6,984	$ 4,004		$ 3,569
Deferred Gain on Disposition of Hotel Assets				81,284
Distributions in Excess of Net Income	(302,705)	(267,740)		(335,373)
Noncontrolling Interests	$ 64,574	$ 62,010		$ 54,286
Accounting Standards Update 2017-05 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in Unconsolidated Joint Ventures			$ 51,307
Deferred Gain on Disposition of Hotel Assets			0
Distributions in Excess of Net Income			(212,145)
Noncontrolling Interests			60,079
Difference Between Guidance In Effect Before And After Topic 610 [Member] | Accounting Standards Update 2017-05 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in Unconsolidated Joint Ventures			47,738
Deferred Gain on Disposition of Hotel Assets			(81,284)
Distributions in Excess of Net Income			123,228
Noncontrolling Interests			$ 5,793