Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 11,484	$ 46,360
Short-term investments	750	750
Accounts receivable, net	156,366	160,167
Inventories, net	193,188	173,999
Income taxes receivable	6,140	6,929
Other current assets	35,588	29,178
Total current assets	403,516	417,383
Property, plant and equipment, net	541,686	536,686
Goodwill	296,529	304,805
Intangibles, net	177,766	203,473
Deferred income tax assets, net	66,823	54,302
Other non-current assets	43,820	34,603
Total assets	1,530,140	1,551,252
Current liabilities:
Accounts payable	112,065	118,424
Accrued expenses	65,054	68,786
Current portion of long-term debt	3,105	4,000
Income taxes payable	3,785	3,849
Total current liabilities	184,009	195,059
Long-term debt (less current portion)	686,756	679,552
Non-current income tax liabilities	15,225	5,731
Deferred income tax liabilities, net	32,220	28,539
Embedded derivative liability	8,161	4,685
Other non-current liabilities	45,106	47,269
Commitments and contingencies (Note 21)
Mezzanine equity:
Redeemable preferred shares, $0.01 par value, 1,000,000 shares authorized, 150,000 shares outstanding at September 30, 2018 and December 31, 2017	157,566	144,694
European non-controlling redeemable equity	19,989
Shareholders' equity:
Common stock, $0.01 par value Authorized-100,000,000 shares; Issued and outstanding - 25,019,237 shares at September 30, 2018 (24,917,025 shares at December 31, 2017)	88,553	89,755
Accumulated other comprehensive loss	(88,320)	(89,121)
Retained earnings	380,875	393,146
Superior shareholders' equity	381,108	393,780
Non-controlling interests		51,943
Total shareholders' equity	381,108	445,723
Total liabilities, mezzanine equity and shareholders' equity	$ 1,530,140	$ 1,551,252