Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 20,081	$ 148,833
Accounts receivable, net	253,416	78,462
Inventories	51,581	56,106
Prepaid expenses and other assets	17,822	19,803
Total current assets	342,900	303,204
Property, plant and equipment, net	260,519	171,300
Goodwill and other intangible assets, net	73,770	74,084
Operating lease assets	37,056	40,049
Other assets	3,990	3,602
Total assets	718,235	592,239
Current liabilities:
Accounts payable	33,345	15,227
Accrued expenses and other liabilities	71,164	58,265
Accrued warranty	5,600	5,178
Total current liabilities	110,109	78,670
Operating lease liabilities	30,182	34,242
Non-current accrued warranty	24,049	20,317
Deferred income taxes	9,831	9,831
Other long-term liabilities		4
Total liabilities	174,171	143,064
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value, 180,000,000 shares authorized; 140,563,175 and 140,374,926 shares issued and 115,785,673 and 116,481,442 shares outstanding at September 30, 2020 and December 31, 2019, respectively	1,406	1,404
Additional paid-in capital	124,923	123,294
Retained earnings	694,010	561,680
Treasury stock, at cost, 24,777,502 and 23,893,484 shares at September 30, 2020 and December 31, 2019, respectively	(276,275)	(237,203)
Total stockholders' equity	544,064	449,175
Total liabilities and stockholders' equity	$ 718,235	$ 592,239