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Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents $ 475,713 $ 742,546
Accounts receivable, net of allowance for doubtful accounts of $1,729 and $105, respectively 455,971 436,560
Contract assets 155,898 146,496
Inventories 321,194 268,917
Prepaid expenses and other assets 34,988 36,018
Income taxes receivable 38 120
Total current assets 1,443,802 1,630,657
Property, plant and equipment, net of accumulated depreciation of $452,611 and $432,043, respectively 208,495 186,473
Goodwill 192,116 191,616
Deferred income taxes 4,034 4,034
Other, net 92,324 96,524
Total assets 1,940,771 2,109,304
Current liabilities:    
Current installments of long-term debt and capital lease obligations 4,880 18,274
Accounts payable 373,879 362,701
Income taxes payable 6,438 11,663
Accrued liabilities 92,976 85,679
Total current liabilities 478,173 478,317
Long-term debt and capital lease obligations, less current installments 149,341 193,406
Other long-term liabilities 90,615 89,749
Deferred income taxes 20,960 8,694
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 - 45,130 and 49,143, respectively 4,513 4,914
Additional paid-in capital 596,110 634,192
Retained earnings 609,577 708,181
Accumulated other comprehensive loss (8,518) (8,149)
Total shareholders' equity 1,201,682 1,339,138
Total liabilities and shareholders' equity $ 1,940,771 $ 2,109,304