Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenues	$ 394,667	$ 379,451	$ 785,809	$ 752,366
Operating expenses:
Depreciation, depletion, and amortization	29,051	28,913	58,459	58,320
Selling, general and administrative	27,482	23,546	59,431	48,303
Impairment of long-lived assets	747	8,773	747	8,773
Total operating expenses	353,747	350,743	708,958	686,856
Operating income	40,920	28,708	76,851	65,510
Other income (expense):
Income (loss) from investments in partially owned entities	252	(1,324)	112	(1,351)
Impairment of investments in partially owned entities	0	(6,496)	0	(6,496)
Interest expense	(22,929)	(28,288)	(47,424)	(56,015)
Interest income	1,109	310	1,733	567
Loss on debt extinguishment and modification	0	(430)	(21,385)	(600)
Foreign currency exchange gain (loss)	1,511	(52)	2,191	(2,825)
Other income (expense), net	33	(728)	89	(1,212)
Income (loss) before income tax and gain from sale of real estate, net of tax	20,896	(8,300)	12,167	(2,422)
Income tax benefit (expense):
Current	(1,323)	(3,368)	(2,390)	(5,610)
Deferred	1,449	3,283	2,605	4,031
Total income tax benefit (expense)	126	(85)	215	(1,579)
Gain from sale of real estate, net of tax	8,384	0	8,384	0
Net income (loss)	29,406	(8,385)	20,766	(4,001)
Less distributions on preferred shares of beneficial interest - Series A	0	(8)	(1)	(8)
Less distributions on preferred shares of beneficial interest - Series B	0	(7,108)	(1,817)	(14,218)
Less accretion on preferred shares of beneficial interest - Series B	0	(218)	0	(438)
Net income (loss) attributable to common shares of beneficial interest	$ 29,406	$ (15,719)	$ 18,948	$ (18,665)
Weighted average common shares outstanding – basic (in shares)	143,499	70,049	133,965	69,990
Weighted average common shares outstanding – diluted (in shares)	146,474	70,049	136,737	69,990
Net loss per common share of beneficial interest - basic (in USD per share)	$ 0.20	$ (0.22)	$ 0.13	$ (0.27)
Net loss per common share of beneficial interest - diluted (in USD per share)	0.20	(0.22)	0.14	(0.27)
Distributions declared per common share of beneficial interest (in USD per share)	$ 0.19	$ 0.07	$ 0.36	$ 0.14
Operating Segments
Revenues:
Revenues	$ 394,667	$ 379,451	$ 785,809	$ 752,366
Operating expenses:
Operating income	98,200	89,940	195,488	180,906
Operating Segments | Rent, storage, and warehouse services revenues
Revenues:
Revenues	287,712	281,663	574,229	557,471
Operating expenses:
Cost of operations	196,877	196,859	393,824	389,146
Operating income	90,835	84,804	180,405	168,325
Operating Segments | Third-party managed services
Revenues:
Revenues	65,755	59,638	129,632	118,005
Operating expenses:
Cost of operations	61,896	56,155	121,995	111,534
Operating income	3,859	3,483	7,637	6,471
Operating Segments | Transportation services
Revenues:
Revenues	38,889	35,796	77,234	71,977
Operating expenses:
Cost of operations	35,303	32,707	70,054	65,335
Operating income	3,586	3,089	7,180	6,642
Operating Segments | Other revenues
Revenues:
Revenues	2,311	2,354	4,714	4,913
Operating expenses:
Cost of operations	2,391	3,790	4,448	5,445
Operating income	$ (80)	$ (1,436)	$ 266	$ (532)