Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 2,553	$ 5,995
Accounts receivable, net	95,654	47,386
Inventories	18,756	23,104
Prepaid expenses and other assets	4,197	13,409
Deferred income taxes	9,136	9,136
Total current assets	130,296	99,030
Property, plant and equipment, net	98,943	100,924
Goodwill and other intangibles	10,523	10,526
Other assets	2,037	1,518
Total assets	241,799	211,998
Current liabilities:
Accounts payable	17,573	17,733
Accrued expenses and other liabilities	29,465	28,891
Accrued warranty	6,825	6,825
Line of credit	43,000	7,000
Total current liabilities	96,863	60,449
Deferred income taxes	4,597	4,597
Non-current accrued warranty	24,456	26,698
Other long-term liabilities	3,611	3,791
Total liabilities	129,527	95,535
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, 80,000,000 shares authorized; 34,842,137 and 34,819,259 shares issued and 29,348,456 and 30,904,530 shares outstanding at June 30, 2016 and December 31, 2015, respectively	348	348
Additional paid-in capital	119,361	116,947
Retained earnings	166,076	119,395
Treasury stock, at cost, 5,493,681 and 3,914,729 shares at June 30, 2016 and December 31, 2015, respectively	(173,513)	(120,227)
Total stockholders' equity	112,272	116,463
Total liabilities and stockholders' equity	$ 241,799	$ 211,998