Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 369,301	$ 390,808
Restricted cash	1,142	5,182
Accounts receivable, net of allowance for doubtful accounts of $828 and $1,371, respectively	290,073	309,331
Contract assets	154,629	142,779
Inventories	415,322	327,377
Prepaid expenses and other assets	36,264	26,457
Income taxes receivable	246	417
Total current assets	1,266,977	1,202,351
Property, plant and equipment, net	188,318	185,272
Operating lease right-of-use assets	89,567	79,966
Goodwill	192,116	192,116
Deferred income taxes	4,941	4,924
Other assets, net	76,872	79,606
Total assets	1,818,791	1,744,235
Current liabilities:
Current installments of long-term debt	9,259	9,161
Accounts payable	380,164	282,208
Advance payments from customers	88,686	84,122
Income taxes payable	7,330	5,572
Accrued liabilities	95,970	100,073
Total current liabilities	581,409	481,136
Long-term debt, less current installments	126,639	131,051
Operating lease liabilities	80,580	72,120
Other long-term liabilities	59,024	65,552
Deferred income taxes	3,861	4,788
Commitments and contingencies
Shareholders’ equity:
Preferred stock, $0.10 par value; 5,000 shares authorized, none issued
Common stock, $0.10 par value; 145,000 shares authorized; issued and outstanding - 35,566 and 36,295, respectively	3,558	3,629
Additional paid-in capital	503,386	510,405
Retained earnings	476,855	492,205
Accumulated other comprehensive loss	(16,521)	(16,651)
Total shareholders’ equity	967,278	989,588
Total liabilities and shareholders' equity	$ 1,818,791	$ 1,744,235