Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 15,573	$ 12,849
Accounts receivable, net of allowance of $4,433 and $3,738, respectively	245,807	236,444
Inventories, net	187,255	176,207
Prepaid expenses and other current assets	36,836	21,467
Total current assets	485,471	446,967
Property, plant, and equipment, net	97,720	96,885
Operating lease assets	16,082	18,120
Goodwill	510,540	510,942
Acquired intangibles	132,107	141,504
Other assets	420	483
Total assets	1,242,340	1,214,901
Current liabilities:
Accounts payable	159,214	172,286
Accrued expenses and other current liabilities	67,495	67,993
Billings in excess of cost	60,992	46,711
Total current liabilities	287,701	286,990
Long-term debt	42,367	23,781
Deferred income taxes	40,221	40,278
Non-current operating lease liabilities	9,377	11,390
Other non-current liabilities	24,272	27,204
Stockholders’ equity:
Preferred stock, $0.01 par value; authorized 10,000 shares; none outstanding	0	0
Common stock, $0.01 par value; authorized 100,000 shares in 2022 and 2021; 33,972 shares and 33,799 shares issued and outstanding in 2022 and 2021	340	338
Additional paid-in capital	315,891	314,541
Retained earnings	561,028	545,572
Accumulated other comprehensive (loss) income	(16)	187
Cost of 1,179 and 1,107 common shares held in treasury in 2022 and 2021	(38,841)	(35,380)
Total stockholders’ equity	838,402	825,258
Total liabilities and shareholders' equity	$ 1,242,340	$ 1,214,901