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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt - Credit Facilities (Details)	1 Months Ended	12 Months Ended
Debt - Credit Facilities (Details)	Mar. 31, 2018	Dec. 31, 2018 USD ($) asset	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Line of credit, future borrowing capacity if extended		$ 750,000,000
Debt Instrument, Fair Value Adjustment, Net		33,400,000
Early Repayment of Senior Secured Notes		539,026,000	$ 990,000	$ 0
Gain (Loss) on Extinguishment of Debt		5,996,000	0	$ 0
Unamortized debt issuance costs on term loans		(5,835,000)	(4,046,000)
Unsecured Debt, Gross		1,175,000,000	1,175,000,000
Long-term Debt		$ 2,202,676,000	2,880,488,000
Revolving Credit Facility and Term Loans \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Spread over variable interest rate basis		1.45%
Revolving Credit Facility and Term Loans \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Spread over variable interest rate basis		3.00%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		103.00%
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	102.813%
Gain (Loss) on Extinguishment of Debt		$ 7,662,341
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 505,322,000	1,062,716,000
Secured Debt [Member]
Debt Instrument [Line Items]
Number of Assets Encumbered \| asset		18
Debt, net		$ 528,189,000	646,818,000
Secured Debt [Member] \| Five Point Six Three Percent Due March 2023 [Member]
Debt Instrument [Line Items]
Number of Assets Encumbered \| asset		0
Debt Instrument, Interest Rate, Stated Percentage		5.625%
Long-term Debt, Gross		$ 0	552,669,000
Unsecured Debt
Debt Instrument [Line Items]
Unsecured Debt		1,169,165,000	1,170,954,000
Unsecured Debt \| $400 Million Term Loan Maturing 2021
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 400,000,000
Interest Rate		3.11%
Unsecured Debt		$ 400,000,000	400,000,000
Unsecured Debt \| $400 Million Term Loan Maturing 2019
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 400,000,000.0
Interest Rate		3.22%
Unsecured Debt		$ 400,000,000	400,000,000
Unsecured Debt \| $225 Million Term Loan Maturing 2019
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 225,000,000.0
Interest Rate		3.44%
Unsecured Debt		$ 225,000,000	225,000,000
Unsecured Debt \| $150 Million Term Loan Maturing 2022
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 150,000,000.0
Interest Rate		3.08%
Unsecured Debt		$ 150,000,000	150,000,000
Unsecured Debt \| Six Point Zero Zero Percent Due June 2025 [Member]
Debt Instrument [Line Items]
Number of Assets Encumbered \| asset		0
Debt Instrument, Interest Rate, Stated Percentage		6.00%
Long-term Debt, Gross		$ 505,322,000	510,047,000
The Revolver \| The Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 600,000,000.0
Additional maturity term		1 year
Interest Rate		4.00%
Remaining borrowing capacity		$ 600,000,000
Unsecured Debt		$ 0	0
The Revolver \| The Revolver \| Minimum
Debt Instrument [Line Items]
Unused facility fee percentage		0.20%
The Revolver \| The Revolver \| Maximum
Debt Instrument [Line Items]
Unused facility fee percentage		0.30%
Accounting Standards Update 2015-03 \| Prepaid Expenses and Other Current Assets
Debt Instrument [Line Items]
Unamortized deferred financing costs on the Revolver		$ 1,500,000	2,600,000
Senior Secured Notes [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Adjustment, Net			28,700,000
Early Repayment of Senior Secured Notes		539,025,024
Senior Unsecured Notes [Member] \| Unsecured Debt
Debt Instrument [Line Items]
Debt Instrument, Fair Value Adjustment, Net		30,300,000	$ 35,100,000
Embassy Suites Boston Marlborough & Sheraton Philadelphia Society Hill [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt		5,100,000
Embassy Suites Boston Marlborough & Sheraton Philadelphia Society Hill [Member] \| Senior Secured Notes [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt		$ 5,100,000