Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 411,786	$ 347,558
Restricted cash	0	16,398
Accounts receivable, net of allowance for doubtful accounts of $10,085 and $10,085, respectively	317,862	324,424
Contract assets	159,962	161,061
Inventories	338,437	314,956
Prepaid expenses and other current assets	35,863	29,566
Income taxes receivable	1,092	1,119
Total current assets	1,265,002	1,195,082
Property, plant and equipment, net of accumulated depreciationof $478,616 and $460,708, respectively	201,580	205,819
Operating lease right-of-use assets	77,033	76,859
Goodwill	192,116	192,116
Deferred income taxes	5,274	5,274
Other assets, net	82,377	84,724
Total assets	1,823,382	1,759,874
Current liabilities:
Current installments of long-term debt	8,868	8,825
Accounts payable	315,729	302,994
Income taxes payable	7,537	7,895
Accrued liabilities	127,205	139,531
Total current liabilities	459,339	459,245
Long-term debt, less current installments	231,798	138,912
Operating lease liabilities	67,009	67,898
Other long-term liabilities	64,367	65,483
Deferred income taxes	11,247	13,504
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 - and outstanding - 36,415 and 36,957, respectively	3,642	3,696
Additional paid-in capital	505,283	512,019
Retained earnings	502,692	515,876
Accumulated other comprehensive loss	(21,995)	(16,759)
Total shareholders' equity	989,622	1,014,832
Commitments and contingencies
Total liabilities and shareholders' equity	$ 1,823,382	$ 1,759,874