Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 458,102	$ 742,546
Accounts receivable, net of allowance for doubtful accounts of $1,733 and $105, respectively	468,161	436,560
Contract assets	140,082	146,496
Inventories	309,975	268,917
Prepaid expenses and other assets	27,024	36,018
Income taxes receivable	206	120
Total current assets	1,403,550	1,630,657
Property, plant and equipment, net	210,954	186,473
Goodwill	192,116	191,616
Deferred income taxes	2,478	4,034
Other, net	90,685	96,524
Total assets	1,899,783	2,109,304
Current liabilities:
Current installments of long-term debt and capital lease obligations	6,793	18,274
Accounts payable	422,053	362,701
Income taxes payable	10,435	11,663
Accrued liabilities	97,878	85,679
Total current liabilities	537,159	478,317
Long-term debt and capital lease obligations, less current installments	147,277	193,406
Other long-term liabilities	68,799	89,749
Deferred income taxes	14,323	8,694
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 - 41,357 and 49,143, respectively	4,136	4,914
Additional paid-in capital	554,939	634,192
Retained earnings	584,274	708,181
Accumulated other comprehensive loss	(11,124)	(8,149)
Total shareholders' equity	1,132,225	1,339,138
Commitments and contingencies
Total liabilities and shareholders' equity	$ 1,899,783	$ 2,109,304