CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 342,621	$ 384,356
Trade receivables, net	316,921	279,253
Inventories, net	408,066	368,354
Deferred income taxes	27,299	24,951
Prepaids and other current assets	26,613	21,899
Total current assets	1,121,520	1,078,813
Property, plant and equipment, net	316,288	304,806
Other assets	10,752	10,993
Total assets	1,448,560	1,394,612
Current liabilities:
Accounts payable	55,010	38,801
Accrued income taxes	8,136	13,628
Customer prepayments	69,712	45,025
Accrued compensation	18,977	21,556
Other accrued liabilities	17,570	23,780
Total current liabilities	169,405	142,790
Deferred income taxes	9,571	9,804
Total liabilities	178,976	152,594
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, 10,000,000 shares authorized at $0.01 par value (none issued)	0	0
Common stock: 100,000,000 shares authorized at $0.01 par value, 39,977,175 and 40,822,627 shares issued and outstanding at June 30, 2014 and December 31, 2013	398	407
Additional paid-in capital	109,170	191,965
Retained earnings	1,163,758	1,069,816
Accumulated other comprehensive losses	(3,742)	(20,170)
Total stockholders' equity	1,269,584	1,242,018
Total liabilities and stockholders' equity	$ 1,448,560	$ 1,394,612