Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 348,042	$ 458,102
Accounts receivable, net of allowance for doubtful accounts of $69 and $1,733, respectively	348,099	468,161
Contract assets	161,068	140,082
Inventories	315,835	309,975
Prepaid expenses and other assets	24,017	27,024
Income taxes receivable	1,054	206
Total current assets	1,198,115	1,403,550
Property, plant and equipment, net of accumulated depreciation of $471,987 and $460,708, respectively	199,256	210,954
Operating lease right-of-use assets	79,854	0
Goodwill	192,116	192,116
Deferred income taxes	2,257	2,478
Other, net	87,148	90,685
Total assets	1,758,746	1,899,783
Current liabilities:
Current installments of long-term debt	8,784	6,793
Accounts payable	295,693	422,053
Income taxes payable	8,892	10,435
Accrued liabilities	127,868	97,878
Total current liabilities	441,237	537,159
Long-term debt, less current installments	141,017	147,277
Operating lease liabilities	70,167	0
Other long-term liabilities	64,722	68,799
Deferred income taxes	12,831	14,323
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 - 37,036 and 41,357, respectively	3,704	4,136
Additional paid-in capital	512,401	554,939
Retained earnings	530,660	584,274
Accumulated other comprehensive loss	(17,993)	(11,124)
Total shareholders' equity	1,028,772	1,132,225
Commitments and contingencies
Total liabilities and shareholders' equity	$ 1,758,746	$ 1,899,783