Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 400,428	$ 390,808
Restricted cash		5,182
Accounts receivable, net of allowance for doubtful accounts of $1,371 and $1,371, respectively	276,287	309,331
Contract assets	148,205	142,779
Inventories	355,164	327,377
Prepaid expenses and other assets	32,456	26,457
Income taxes receivable	900	417
Total current assets	1,213,440	1,202,351
Property, plant and equipment, net	183,294	185,272
Operating lease right-of-use assets	88,915	79,966
Goodwill	192,116	192,116
Deferred income taxes	4,924	4,924
Other assets, net	78,064	79,606
Total assets	1,760,753	1,744,235
Current liabilities:
Current installments of long-term debt	9,209	9,161
Accounts payable	325,226	282,208
Advance payments from customers	76,833	84,122
Income taxes payable	6,671	5,572
Accrued liabilities	87,171	100,073
Total current liabilities	505,110	481,136
Long-term debt, less current installments	128,862	131,051
Operating lease liabilities	79,659	72,120
Other long-term liabilities	64,948	65,552
Deferred income taxes	4,627	4,788
Commitments and contingencies
Shareholders’ equity:
Preferred stock, $0.10 par value; 5,000 shares authorized, none issued	0	0
Common stock, $0.10 par value; 145,000 shares authorized; issued and outstanding – 36,062 and 36,295, respectively	3,608	3,629
Additional paid-in capital	505,659	510,405
Retained earnings	486,267	492,205
Accumulated other comprehensive loss	(17,987)	(16,651)
Total shareholders’ equity	977,547	989,588
Total liabilities and shareholders' equity	$ 1,760,753	$ 1,744,235