Commitments and Contingencies - Contractual Obligations (Details) - 12 months ended Dec. 31, 2016 $ in Thousands, £ in Millions	GBP (£)	USD ($)
Material commitments
Total		$ 572,305
2017		161,593
2018-2019		20,702
2020-2021		13,706
More than Five Years		376,304
Credit Enhancement Guarantee
Third party debt collateralized by facilities, debt amount		91,000
Third party debt collateralized by facilities, asset carrying amount		629,000
Ground and other operating leases
Material commitments
Total		412,055
2017		7,294
2018-2019		14,751
2020-2021		13,706
More than Five Years		376,304
Construction loan commitments
Material commitments
Total		124
2017		124
Development commitments
Material commitments
Total		117,019
2017		114,229
2018-2019		2,790
HC-One Facility
Material commitments
Total	£ 35	43,107
2017		39,946
2018-2019		3,161
Unsecured Debt. \| Revolving credit facility
Material commitments
Total		$ 100,000
Decrease of credit facility as a percentage of retained cash flow	50.00%

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The decrease of Unsecured Revolving Credit Facility will automatically and permanently each calendar month as a precentage of retained cash flow for the prior calendar month.

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The carrying value of facilities owned by the entity that are collateral for third party debt.

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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No definition available.

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Amount of contractual obligation due in the next 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 contractual obligation due in the second and third fiscal years 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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No definition available.

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