COMBINED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - 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
Revenues:
Rental and related revenues									$ 469,698	$ 574,332	$ 568,380
Tenant recoveries									1,473	1,464	1,029
Total revenues	$ 103,567	$ 123,667	$ 123,690	$ 120,247	$ 141,775	$ 146,000	$ 145,549	$ 142,472	471,171	575,796	569,409
Costs and expenses:
Depreciation and amortization									165,555	244,624	247,914
Operating									3,720	3,729	3,247
General and administrative									22,058	23,907	20,690
Interest									25,019
Impairments									167,057	227,383
Total costs and expenses									383,409	499,643	271,851
Other income:
Gain (loss) on sales of real estate									10,583	39,140	(1,917)
Other income, net									282	70	953
Total other income, net									10,865	39,210	(964)
Income before income taxes and income from and impairment of equity method investment	(105,262)	58,693	83,799	61,397	(63,675)	79,634	76,271	23,133	98,627	115,363	296,594
Income tax expense									(17,482)	(798)	(765)
Income from equity method investment										34,510	60,469
Impairment of equity method investment										(35,882)	(63,255)
Net income (loss)	$ (104,730)	$ 53,520	$ 83,593	$ 48,762	$ (88,672)	$ 74,990	$ 89,908	$ 36,967	81,145	113,193	293,043
Comprehensive income (loss)									$ 81,145	$ 113,193	$ 293,043
Earnings per common share, basic and diluted	$ (1.12)	$ 0.57	$ 0.89	$ 0.52	$ (0.95)	$ 0.80	$ 0.96	$ 0.39	$ 0.87	$ 1.21	$ 3.13