Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 14,782	$ 17,253
Accounts receivable, net	81,629	76,633
Inventories, net	72,630	74,725
Prepaid expenses	13,124	11,335
Other current assets	14,482	15,316
Total current assets	196,647	195,262
Property and equipment, net	261,989	282,378
Goodwill	64,159	64,783
Intangible assets	5,352	5,965
Non-current deferred tax asset	9,987	10,103
Other assets	9,054	9,358
Total assets	547,188	567,849
Current liabilities:
Notes payable	8,112	8,398
Accounts payable	41,338	39,856
Accrued expenses	65,914	64,155
Current maturities of long-term debt	9,238	10,614
Total current liabilities	124,602	123,023
Long-term debt, net of current maturities	473,168	473,904
Liabilities under capital leases	13,757	15,952
Non-current deferred tax liability	12,113	12,897
Pension, other post-retirement and post-employment obligations	65,166	69,205
Other long-term liabilities	9,399	9,334
Commitments and contingencies
Stockholders’ deficit
Preferred stock, $0.001 par value, 1,000,000 shares authorized; no shares outstanding as of June 30, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value, 20,000,000 shares authorized; 16,427,603 and 16,367,743 shares outstanding as of June 30, 2018 and December 31, 2017, respectively	16	16
Paid-in capital	433,048	432,489
Accumulated deficit	(460,158)	(457,712)
Accumulated other comprehensive loss	(123,923)	(111,259)
Total stockholders’ deficit	(151,017)	(136,466)
Total liabilities and stockholders’ deficit	$ 547,188	$ 567,849