Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 73,773	$ 105,504
Short-term investments	33,243	3,246
Accounts receivable, less allowance for doubtful accounts of $38 and $128 as of December 31, 2019 and 2018, respectively	90,531	99,385
Other receivables	16,566	36,699
Inventory, net	98,305	99,848
Prepaid expenses and other current assets	7,892	10,744
Total Current Assets	320,310	355,426
Property, plant and equipment, net	73,708	80,635
Deferred tax assets, net	7,561	37,187
Goodwill	6,968	7,106
Intangibles, net	27,821	33,183
Other assets	14,261	5,668
Long-term investments	94,489	108,822
Total Assets	545,118	628,027
Current Liabilities
Accounts payable	44,870	60,054
Bonds payable	24,600	1,000
Unearned revenue	11,963	17,940
Accrued expenses and other current liabilities	13,876	11,746
Accrued wages and benefits	13,890	14,752
Income tax payable, net	3,512	12,518
Total Current Liabilities	112,711	118,010
Non-current unearned revenue	6,012	5,296
Pension liability	15,886	13,086
Deferred compensation liability	21,698	18,256
Other non-current liabilities	8,385	2,500
Bonds payable		24,600
Total Liabilities	164,692	181,748
Commitments and contingencies (see Note 16)
Stockholders' Equity
Common stock, par value $0.01 per share; 200,000 shares authorized; 79,652 shares issued and 48,020 shares outstanding as of December 31, 2019 and 79,652 shares issued and 47,751 shares outstanding as of December 31, 2018	797	797
Additional paid-in capital	274,632	267,670
Accumulated other comprehensive loss	(16,417)	(14,416)
Retained earnings	806,702	883,975
Less treasury stock at cost: 31,638 and 31,901 shares as of December 31, 2019 and 2018, respectively	(685,288)	(691,747)
Total Stockholders' Equity	380,426	446,279
Total Liabilities and Stockholders' Equity	$ 545,118	$ 628,027