Dispositions (Results of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Expenses:
Net income from discontinued operations	$ (167)	$ (118)	$ (148)	$ (489)	$ (2,331)	$ (22,383)	$ 18,243	$ 17,574	$ (922)	$ 11,103	$ 99,735
CCP | Spinoff
Revenues
Rental income									0	196,848	295,767
Income from loans and investments									0	2,148	3,392
Interest and other income									0	63	2
Total Revenues									0	199,059	299,161
Expenses:
Interest									0	61,613	87,648
Depreciation and amortization									0	79,479	101,760
General, administrative and professional fees									0	9	9
Merger-related expenses and deal costs									922	46,402	1,746
Other									0	1,332	13,184
Total expenses									922	188,835	204,347
Income before real estate dispositions and noncontrolling interest									(922)	10,224	94,814
Gain (loss) on real estate dispositions									0	0	0
Net income from discontinued operations									(922)	10,224	94,814
Net income attributable to noncontrolling interest									0	120	185
Net income from discontinued operations attributable to common stockholders									$ (922)	$ 10,104	$ 94,629