Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 106,084	$ 105,699
Accounts receivable, net	117,909	91,163
Inventories	42,919	57,801
Prepaid expenses and other assets	19,251	15,562
Total current assets	286,163	270,225
Property, plant and equipment, net	129,612	117,144
Goodwill and other intangibles	74,294	74,503
Operating lease assets	42,571	0
Other assets	3,558	3,250
Total assets	536,198	465,122
Current liabilities:
Accounts payable	27,307	31,084
Accrued expenses and other liabilities	48,762	56,291
Accrued warranty	5,400	5,400
Line of credit	0	0
Total current liabilities	81,469	92,775
Operating lease liabilities	37,056	0
Deferred income taxes	2,125	2,125
Non-current accrued warranty	23,936	25,354
Other long-term liabilities	79	1,905
Total liabilities	144,665	122,159
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, 120,000,000 shares authorized; 70,137,027 and 69,998,336 shares issued and 58,440,204 and 58,551,653 shares outstanding at June 30, 2019 and December 31, 2018, respectively	701	700
Additional paid-in capital	122,720	124,224
Retained earnings	484,207	416,942
Treasury stock, at cost, 11,696,823 and 11,446,683 shares at June 30, 2019 and December 31, 2018, respectively	(216,095)	(198,903)
Total stockholders' equity	391,533	342,963
Total liabilities and stockholders' equity	$ 536,198	$ 465,122