Rent and Tenant Receivables and Other Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Accounts receivable, net	$ 46,518		$ 46,518		$ 49,148
Straight-line rent receivable, net	212,161		212,161		201,584
Deferred costs, net	10,947		10,947		16,154
Prepaid expenses	9,519		9,519		6,814
Leasehold improvements, property and equipment, net	13,441		13,441		14,702
Restricted escrow deposits	12,385		12,385		5,741
Deferred tax asset and tax receivable	36,876		36,876		31,113
Program development costs, net	3,797		3,797		3,161
Interest rate swap assets, at fair value	314		314		199
Other assets	3,055		3,055		2,089
Total	349,013		349,013		330,705
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	35,500		35,500		31,700
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	300	$ 300	600	$ 600
Accumulated amortization and depreciation	4,100		4,100		3,500
Property and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated amortization and depreciation	4,700		4,700		3,900
Depreciation expense	400	500	800	1,000
Line of Credit [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	2,600	$ 2,600	5,200	$ 5,200
Accumulated amortization for deferred costs	35,000		35,000		29,800
Accounts Receivable [Member]
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts	6,400		6,400		5,700
Rent Receivables [Member]
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts	$ 1,600		$ 1,600		$ 300