Rent and Tenant Receivables and Other Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Accounts receivable, net	$ 38,182		$ 38,182		$ 49,148
Straight-line rent receivable, net	220,975		220,975		201,584
Deferred costs, net	8,347		8,347		16,154
Prepaid expenses	10,147		10,147		6,814
Leasehold improvements, property and equipment, net	12,982		12,982		14,702
Restricted escrow deposits	5,644		5,644		5,741
Deferred tax asset and tax receivable	32,753		32,753		31,113
Program development costs, net	3,828		3,828		3,161
Interest rate swap assets, at fair value	351		351		199
Other assets	3,729		3,729		2,089
Total	336,938		336,938		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	5,900		5,900		31,700
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	300	$ 300	900	$ 900
Accumulated amortization and depreciation	4,400		4,400		3,500
Property and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated amortization and depreciation	5,200		5,200		3,900
Depreciation expense	500	600	1,300	1,600
Line of Credit [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	2,600	$ 2,600	7,800	$ 7,800
Accumulated amortization for deferred costs	37,600		37,600		29,800
Accounts Receivable [Member]
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts	6,000		6,000		5,700
Rent Receivables [Member]
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts	$ 1,600		$ 1,600		$ 300