Investment In Hotel Properties (Narrative) (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) property shares	Sep. 30, 2017 USD ($) property	Dec. 31, 2016 USD ($) shares	Sep. 30, 2017 USD ($) property shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)
Business Acquisition [Line Items]
Acquisition costs		$ 297,000		$ 2,121,000
Assumption of Debt	$ 44,483,000	44,483,000		44,483,000
Asset Impairment Charges		3,812,000		3,812,000
Assets Held-for-sale, Long Lived	0	0	$ 98,473,000	0		$ 98,473,000
Property Insurance Receivable	6,382,000	6,382,000		6,382,000
Proceeds from Contribution of Hotel Property Assets to Unconsolidated Joint Venture					$ 429,250,000
Total Purchase Price				300,699,000
Investment in hotel properties	2,034,588,000	2,034,588,000	1,767,570,000	2,034,588,000		1,767,570,000
Reduction of consolidated mortgage debt				122,312,000	156,921,000
Reduction to line of credit and unsecured term loan balance					27,000,000
Repayment of Unsecured Term Loan Borrowing					$ 39,480,000
Assets Held-for-sale [Member]
Business Acquisition [Line Items]
Assets Held-for-sale, Long Lived			98,473,000			98,473,000
Residence Inn, Greenbelt, MD, and the Courtyard, Alexandria, VA [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Total sales price	$ 62,000,000	$ 62,000,000		62,000,000
Approximate gain (loss) on sale				$ 18,731,000
Residence Inn, Greenbelt, MD, Courtyard, Alexandria, VA, Hyatt House, Scottsdale, AZ, Hyatt House, Pleasant Hill, CA, and Hyatt House, Pleasanton, CA [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Number of Real Estate Properties | property	3	3		3
Sale Agreement, Total Purchase Price							$ 185,000,000
Sale Agreement Increase (Decrease) In Total Purchase Price				$ 7,500,000
Hyatt House, Scottsdale, AZ, Hyatt House, Pleasant Hill, CA, and Hyatt House, Pleasanton, CA [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Number of Real Estate Properties | property	3	3		3
Total Purchase Price				$ 130,500,000
Approximate gain (loss) on sale				$ 70,852,000
Hurricane Irma [Member]
Business Acquisition [Line Items]
Number of Real Estate Properties | property	6	6		6
Asset Impairment Charges				$ 10,194,000
Property Insurance Receivable	$ 6,382,000	$ 6,382,000		6,382,000
Insurance Recoveries		$ 0		$ 0
Hurricane Irma [Member] | Courtyard Cadillac Miami and the Parrot Key Hotel & Resort [Member]
Business Acquisition [Line Items]
Number of Real Estate Properties | property	2	2		2
Hurricane Irma [Member] | Hotel Properties With Minor Damage, Returned To Service [Member]
Business Acquisition [Line Items]
Number of Real Estate Properties | property	4	4		4
Courtyard Miami Beach Lease Buyout [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid	$ 5,000,000		$ 5,000,000
Stock Issued During Period, Shares, Acquisitions | shares	225,000		225,000
Stock Issued During Period, Value, Acquisitions	$ 4,133,000		$ 4,400,000
Write-off of an intangible liability related to the lease			$ 2,000,000
Courtyard Miami Beach Lease Buyout [Member] | Scenario, Plan [Member]
Business Acquisition [Line Items]
Business acquisition, cash paid				$ 10,000,000
Stock Issued During Period, Shares, Acquisitions | shares				450,000
Total Purchase Price						$ 18,831,000