Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, plant, and equipment:
Property, plant, and equipment – gross	$ 2,826,679	$ 2,810,623
Accumulated depreciation and depletion	(1,030,240)	(1,010,903)
Property, plant, and equipment – net	1,796,439	1,799,720
Capitalized leases:
Capitalized leases – gross	76,446	76,216
Accumulated depreciation	(42,996)	(41,051)
Capitalized leases – net	33,450	35,165
Cash and cash equivalents	193,868	48,873
Restricted cash	19,394	21,090
Accounts receivable – net of allowance of $5,804 and $5,309 at March 31, 2018 and December 31, 2017, respectively	178,649	200,006
Identifiable intangible assets – net	26,239	26,645
Goodwill	188,096	188,169
Investments in partially owned entities	15,935	15,942
Other assets	41,685	59,287
Total assets	2,493,755	2,394,897
Liabilities:
Borrowings under revolving line of credit	0	0
Accounts payable and accrued expenses	232,737	241,259
Construction loan - net of deferred financing costs $179 at December 31, 2017	0	19,492
Mortgage notes and term loans - net of discount and deferred financing costs of $15,935 and $31,996, in the aggregate, at March 31, 2018 and December 31, 2017, respectively	1,398,227	1,721,958
Sale-leaseback financing obligations	120,911	121,516
Capitalized lease obligations	36,078	38,124
Unearned revenue	18,200	18,848
Pension and postretirement benefits	16,105	16,756
Deferred tax liability - net	20,423	21,940
Multi-Employer pension plan withdrawal liability	9,086	9,134
Total liabilities	1,851,767	2,209,027
Commitments and Contingencies (Note 13)
Preferred shares of beneficial interest, $0.01 par value – authorized 375,000 Series B Cumulative Convertible Voting and Participating Preferred Shares; aggregate liquidation preference of $375,000; zero and 375,000 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	0	372,794
Shareholders’ equity (deficit):
Preferred shares of beneficial interest, $0.01 par value – authorized 1,000 Series A Cumulative Non-Voting Preferred Shares; aggregate liquidation preference of $125; zero and 125 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	0	0
Common shares of beneficial interest, $0.01 par value – authorized 250,000,000 shares; 142,513,448 and 69,370,609 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	1,425	694
Paid-in capital	1,255,094	394,082
Accumulated deficit and distributions in excess of net earnings	(613,363)	(581,470)
Accumulated other comprehensive loss	(1,168)	(230)
Total shareholders’ equity (deficit)	641,988	(186,924)
Total liabilities, Series B Preferred Shares and shareholders’ equity (deficit)	2,493,755	2,394,897
Land
Property, plant, and equipment:
Property, plant, and equipment – gross	389,565	389,443
Buildings and improvements
Property, plant, and equipment:
Property, plant, and equipment – gross	1,887,206	1,865,727
Capitalized leases:
Capitalized leases – gross	16,827	16,827
Machinery and equipment
Property, plant, and equipment:
Property, plant, and equipment – gross	549,908	555,453
Capitalized leases:
Capitalized leases – gross	$ 59,619	$ 59,389