Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net income	$ (40,459)	$ (138,138)	$ (146,630)
Reconciliation of net income to cash provided by operating activities:
Depreciation and amortization	69,140	72,123	81,838
Impairment of long-lived assets	0	10,223	11,797
Impairment of goodwill	0	92,334	139,444
Provision (benefit) for deferred income taxes	757	30	(605)
Proceeds from Insurance Settlement, Operating Activities Reconciliation	(2,352)	0	0
Offering Costs of Preferred Units	37	3,111	0
Equity compensation expense	1,219	3,028	2,164
Provision for doubtful accounts	968	1,704	508
Amortization of deferred financing costs	3,167	2,739	2,786
Loss on sale of property, plant, and equipment	(315)	(501)	(196)
Other non-cash charges and (credits)	571	1,558	825
Paid-in-Kind Interest	8,380	3,094	0
Gain (Loss) on Extinguishment of Debt	0	(1,405)	0
Liabilities, Fair Value Adjustment	(3,402)	5,036	0
Changes in operating assets and liabilities:
Accounts receivable	(2,706)	11,208	19,732
Inventories	(10,840)	10,542	64,893
Prepaid expenses and other current assets	(501)	1,729	(2,753)
Accounts payable and accrued expenses	15,765	(17,039)	(71,592)
Other	(361)	68	(318)
Net cash provided by operating activities	39,068	61,444	101,893
Investing activities:
Purchases of property, plant, and equipment, net	(25,126)	(10,659)	(95,272)
Proceeds from Insurance Settlement, Investing Activities	2,352	0	0
Advances and other investing activities	21	(22)	(69)
Net cash used in investing activities	(22,753)	(10,681)	(95,341)
Financing activities:
Proceeds from long-term debt, net	80,900	109,000	63,000
Payments of long-term debt	(74,900)	(172,882)	(23,000)
Proceeds from Convertible Debt	(37)	76,934	0
Distributionstononcontrollingholders	(33,068)	(51,254)	(68,360)
Financing costs		(1,688)
Contribution from general partner	0	0	0
Deferred financing cost and other financing activities	(2,229)	(1,688)	0
Net cash (used in) provided by financing activities	(29,334)	(39,890)	(28,360)
Effect of exchange rate changes on cash	(177)	(696)	(1,638)
Increase (decrease) in cash and cash equivalents	(13,196)	10,177	(23,446)
Cash and cash equivalents at beginning of period	20,797	10,620	34,066
Cash and cash equivalents at end of period	7,601	20,797	10,620
Supplemental cash flow information:
Taxes paid	3,005	1,277	598
Interest paid	$ 31,674	$ 32,947	$ 32,994