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 long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Debt - Aggregate Principal Repayments on Mortgage Notes (Details) - Mortgages [Member] $ in Thousands	Dec. 31, 2017 USD ($) note_payable	Aug. 31, 2017 USD ($)	Aug. 29, 2017 USD ($)	Jun. 27, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 30, 2016 USD ($)
Debt Instrument [Line Items]
2018	$ 98,450
2019	222,789
2020	265,186
2021	352,770
2022	314,839
Thereafter	817,004
Total	2,071,038				$ 2,629,949
Mortgage notes in connection with default from non-recourse loan	$ 16,200	$ 41,600	$ 20,500	$ 38,300		$ 11,600
Number of mortgage notes payable in default \| note_payable	1