Other Assets (Details) $ in Thousands, £ in Millions	3 Months Ended
	Mar. 31, 2017 GBP (£)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Other assets
Straight-line rent receivables, net of allowance			$ 316,125	$ 311,776
Allowance on straight-line rent receivables			25,173	25,059
Marketable debt securities, net			18,330	68,630
Leasing costs and inducements, net			87,553	156,820
Goodwill			47,019	42,386
Other			136,380	132,012
Total other assets			605,407	$ 711,624
Four Seasons
Other assets
Market debt security, carrying value	£ 41.0		50,000
Marketable debt security, par value	138.5		$ 101,000
Marketable debt security, par value, discounted | £	83.0
Four Seasons | Other Income
Other assets
Gain on sale	£ 42.0	$ 51,000