Rent and Tenant Receivables and Other Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Accounts receivable, net	$ 48,477		$ 49,148
Straight-line rent receivable	207,420		201,584
Deferred costs, net	13,548		16,154
Prepaid expenses	11,600		6,814
Leasehold improvements, property and equipment, net	14,056		14,702
Restricted escrow deposits	11,555		5,741
Deferred tax asset and tax receivable	32,976		31,113
Program development costs, net	3,182		3,161
Interest rate swap assets, at fair value	371		199
Other assets	3,713		2,089
Total	346,898		330,705
Allowance for doubtful accounts	8,100		6,000
Rent and Tenant Receivables and Other Assets, Net [Member] | Program Development Costs [Member]
Property, Plant and Equipment [Line Items]
Reserves related to program development costs	33,800		31,700
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	300	$ 300
Accumulated amortization and depreciation	3,800		3,500
Property and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated amortization and depreciation	4,300		3,900
Depreciation expense	400	500
Line of Credit [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	2,600	$ 2,600
Accumulated amortization for deferred costs	$ 32,400		$ 29,800