Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 263,421	$ 298,576
Trade receivables, net	240,839	180,095
Inventories, net	350,053	277,802
Deferred income taxes	24,229	23,868
Prepaids and other current assets	13,366	18,961
Total current assets	891,908	799,302
Property, plant and equipment, net	293,074	274,599
Other assets	11,221	11,957
Total assets	1,196,203	1,085,858
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	36,299	35,580
Accrued income taxes	4,516	5,447
Customer prepayments	75,026	76,610
Accrued compensation	14,058	12,584
Other accrued liabilities	25,322	20,779
Total current liabilities	155,221	151,000
Long-term debt, net of current maturities
Deferred income taxes	9,522	9,614
Total liabilities	164,743	160,614
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, 10,000,000 shares authorized at $0.01 par value (none issued)
Common stock: 50,000,000 shares authorized at $0.01 par value, 40,431,518 and 40,175,426 shares issued and outstanding at September 30, 2012 and December 31, 2011	404	402
Additional paid-in capital	177,050	162,505
Retained earnings	869,037	780,780
Accumulated other comprehensive income (loss)	(15,031)	(18,443)
Total stockholders' equity	1,031,460	925,244
Total liabilities and stockholders' equity	$ 1,196,203	$ 1,085,858