Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 96,407	$ 105,504
Short-term investments	28,754	3,246
Accounts receivable, less allowance for doubtful accounts of $81 and $128 at September 30, 2019 and December 31, 2018, respectively	90,647	99,385
Other receivables	18,927	36,699
Inventory, net	104,941	99,848
Prepaid expenses and other current assets	10,327	10,744
Total Current Assets	350,003	355,426
Property, plant and equipment, net	73,384	80,635
Deferred tax assets, net	6,492	37,187
Goodwill	6,968	7,106
Intangibles, net	29,113	33,183
Other assets	23,283	5,668
Long-term investments	90,632	108,822
Total Assets	579,875	628,027
Current Liabilities
Accounts payable	52,842	60,054
Bonds payable	25,600	1,000
Unearned revenue	14,022	17,940
Accrued expenses	15,697	11,746
Accrued wages and benefits	16,569	14,752
Income tax payable, net	3,420	12,518
Total Current Liabilities	128,150	118,010
Non-current unearned revenue	4,581	5,296
Other non-current liabilities	52,189	33,842
Bonds payable		24,600
Total Liabilities	184,920	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 47,826 shares outstanding at September 30, 2019 and 79,652 shares issued and 47,751 shares outstanding at December 31, 2018	797	797
Additional paid-in capital	272,854	267,670
Accumulated other comprehensive loss	(16,506)	(14,416)
Retained earnings	827,783	883,975
Treasury stock at cost: 31,826 and 31,901 shares at September 30, 2019 and December 31, 2018, respectively	(689,973)	(691,747)
Total Stockholders’ Equity	394,955	446,279
Total Liabilities and Stockholders’ Equity	$ 579,875	$ 628,027