Rent and Tenant Receivables and Other Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Accounts receivable, net	$ 48,682		$ 48,682		$ 44,798
Straight-line rent receivable	196,669		196,669		161,079
Deferred costs, net	18,443		18,443		26,110
Prepaid expenses	13,269		13,269		9,773
Leasehold improvements, property and equipment, net	16,845		16,845		18,180
Restricted escrow deposits	3,123		3,123		1,190
Deferred tax asset and tax receivable	27,529		27,529		25,287
Program development costs, net	12,268		12,268		12,855
Interest rate swap assets, at fair value	0		0		1,892
Other assets	2,701		2,701		2,473
Total	339,529		339,529		303,637
Allowance for doubtful accounts	8,300		8,300		6,600
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	18,800		18,800		34,800
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	300	$ 400	900	$ 1,100
Accumulated amortization and depreciation	3,500		3,500		2,600
Property and Equipment [Member]
Property, Plant and Equipment [Line Items]
Accumulated amortization and depreciation	5,300		5,300		3,700
Depreciation expense	600	500	1,600	1,500
Line of Credit [Member]
Property, Plant and Equipment [Line Items]
Amortization expense	2,600	$ 2,600	7,800	$ 8,100
Accumulated amortization for deferred costs	$ 27,200		$ 27,200		$ 19,400