Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,901	$ 30,514
Accounts receivable, net	171,131	66,882
Inventories	36,188	34,524
Prepaid expenses and other assets	18,136	16,878
Total current assets	228,356	148,798
Property, plant and equipment, net	107,652	103,110
Goodwill and other intangibles	75,121	71,319
Other assets	3,316	3,000
Total assets	414,445	326,227
Current liabilities:
Accounts payable	24,817	9,953
Accrued expenses and other liabilities	46,101	46,266
Accrued warranty	6,290	6,290
Line of credit	8,500
Total current liabilities	85,708	62,509
Deferred income taxes	1,286	1,286
Non-current accrued warranty	27,482	28,709
Other long-term liabilities	1,970	2,473
Total liabilities	116,446	94,977
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; 69,959,734 and 69,844,222 shares issued and 58,722,328 and 58,856,860 shares outstanding at June 30, 2018 and December 31, 2017, respectively	700	349
Additional paid-in capital	121,541	122,043
Retained earnings	362,299	282,370
Treasury stock, at cost, 11,237,406 and 10,987,362 shares at June 30, 2018 and December 31, 2017, respectively	(186,541)	(173,512)
Total stockholders' equity	297,999	231,250
Total liabilities and stockholders' equity	$ 414,445	$ 326,227