Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 63,726	$ 57,016
Accounts receivable, net of reserve for doubtful accounts of $6,632 and $5,081	212,565	262,821
Other current financial assets	11,347	12,573
Inventories	164,799	183,629
Income tax receivables	17,924	24,342
Prepaid expenses and other current assets	37,358	34,938
Total current assets	507,718	575,319
Property, plant and equipment, net	534,054
Property, plant and equipment - net		483,534
Operating lease right-of-use assets	27,532
Goodwill	77,341	55,546
Intangible assets - net	50,596	95,245
Investment in equity method affiliates	5,232	5,332
Deferred income tax assets	48,720	52,395
Other financial assets	2,501	2,723
Other assets	3,701	2,928
Total non-current assets	749,676	697,703
Total assets	1,257,394	1,273,022
Current liabilities
Accounts payable	156,298	163,585
Current portion of long term debt and other financial liabilities	36,410	41,020
Current portion of employee benefit plan obligation	908	855
Accrued liabilities	44,931	56,297
Income taxes payable	14,154	28,086
Other current liabilities	32,509	30,493
Total current liabilities	285,211	320,336
Long-term debt, net	630,261	643,748
Employee benefit plan obligation	71,901	60,377
Deferred income tax liabilities	43,308	45,504
Other liabilities	40,701	44,161
Commitments and contingencies	0	0
Total non-current liabilities	786,171	793,790
Stockholders' equity
Common stock	85,032	84,254
Less 505,142 and 517,081 shares of common treasury stock, at cost	(8,515)	(8,683)
Additional paid-in capital	65,562	63,544
Retained earnings	78,296	39,409
Accumulated other comprehensive loss	(34,362)	(19,628)
Total stockholders' equity	186,013	158,896
Total liabilities and stockholders' equity	$ 1,257,394	$ 1,273,022