Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

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Amount of assets pledged to secure a debt instrument.

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Weighted average interest rate of debt outstanding.

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Debt - Mortgage Notes Payable (Details) $ in Thousands		12 Months Ended
Debt - Mortgage Notes Payable (Details) $ in Thousands	Apr. 12, 2018 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property mortgage_note	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Weighted-Average Interest Rate		4.30%
Weighted-Average Years to Maturity		4 years 2 months 12 days
Gain (loss) on extinguishment and forgiveness of debt, net		$ 5,360	$ 18,373	$ (771)
Number of foreclosed notes payable \| mortgage_note			3
Mortgages [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property	1	459	6
Gross Carrying Value of Collateralized Properties		$ 3,793,578
Outstanding Balance		$ 1,917,132	$ 2,071,038
Weighted-Average Interest Rate		4.93%
Mortgage notes in connection with default from non-recourse loan	$ 16,200
Gain (loss) on extinguishment and forgiveness of debt, net	$ 5,200		$ 20,500
Mortgages [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity		3 years 4 months 30 days
Mortgages [Member] \| Fixed-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property		458
Gross Carrying Value of Collateralized Properties		$ 3,760,194
Outstanding Balance		$ 1,903,095
Weighted-Average Interest Rate		4.92%
Mortgages [Member] \| Fixed-rate debt [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Outstanding Balance		$ 50,700
Mortgages [Member] \| Fixed-rate debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity		3 years 5 months 18 days
Mortgages [Member] \| Variable-rate debt [Member]
Debt Instrument [Line Items]
Encumbered Properties \| property		1
Gross Carrying Value of Collateralized Properties		$ 33,384
Outstanding Balance		$ 14,037
Weighted-Average Interest Rate		5.72%
Mortgages [Member] \| Variable-rate debt [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted-Average Years to Maturity		7 months 5 days