Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 43,033	$ 48,138
Accounts receivable, net	90,545	84,615
Inventories	67,531	62,517
Income tax receivable	8,956	8,800
Other current assets	12,431	11,148
Total current assets	222,496	215,218
Property, plant and equipment, net	218,057	223,690
Operating lease right-of-use assets	49,545	50,264
Intangible assets, net	99,479	103,065
Investment in joint venture	28,207	26,983
Other non-current assets	4,532	5,742
Total assets	622,316	624,962
Current liabilities:
Accounts payable	43,232	37,435
Accrued salaries, wages and benefits	24,613	21,296
Income tax payable	3,376	3,557
Current maturities of long-term debt	4,844	4,885
Current portion of operating lease liabilities	4,963	4,797
Other current liabilities	17,042	31,261
Total current liabilities	98,070	103,231
Deferred tax liabilities	10,326	11,178
Long-term debt, net of current portion	151,551	79,025
Operating lease liabilities, net of current portion	54,780	55,053
Other non-current liabilities	25,976	17,237
Total liabilities	340,703	265,724
Commitments and contingencies (Note 11)
Common stock - $0.01 par value per share, 90,000 shares authorized, 42,686 and 43,049 shares issued and outstanding at December 31, 2020 and March 31, 2021, respectively	430	427
Additional paid-in capital	479,341	493,332
Accumulated deficit	(210,788)	(205,875)
Accumulated other comprehensive loss	(34,228)	(33,732)
Total stockholders’ equity	234,755	254,152
Total liabilities, preferred stock, and stockholders’ equity	622,316	624,962
Series D Preferred Stock
Current liabilities:
Perpetual and convertible preferred stock	46,858	0
Series B Preferred Stock
Current liabilities:
Perpetual and convertible preferred stock	$ 0	$ 105,086