Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 115,188	$ 141,053
Accounts receivable, net	200,920	151,096
Inventories	98,176	83,753
Prepaid expenses and other assets	22,878	25,152
Total current assets	437,162	401,054
Property, plant and equipment, net	472,525	460,365
Operating lease assets	37,479	34,571
Goodwill and other intangible assets, net	18,896	19,001
Other assets	6,334	5,330
Total assets	972,396	920,321
Current liabilities:
Accounts payable	61,707	24,861
Accrued expenses and other liabilities	75,013	58,041
Accrued warranty	6,300	5,800
Total current liabilities	143,020	88,702
Deferred income taxes	43,967	43,967
Operating lease liabilities	30,672	28,263
Non-current accrued warranty	22,112	22,795
Other long-term liabilities	11,560	11,560
Total liabilities	251,331	195,287
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding		0
Common stock, $0.01 par value, 180,000,000 shares authorized; 140,787,904 and 140,734,753 shares issued and 114,367,340 and 115,148,152 shares outstanding at March 31, 2022 and December 31, 2021, respectively	1,408	1,407
Additional paid-in capital	127,623	127,787
Retained earnings	1,017,259	946,048
Treasury stock, at cost, 26,420,564 and 25,586,601 shares at March 31, 2022 and December 31, 2021, respectively	(425,225)	(350,208)
Total stockholders' equity	721,065	725,034
Total liabilities and stockholders' equity	$ 972,396	$ 920,321