CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 266,708	$ 287,588
Short-term investments	331,634	327,653
Trade accounts receivable, net	90,457	82,060
Inventories	131,253	134,639
Deferred income taxes	8,585	8,194
Other current assets	30,008	28,048
Total current assets	858,645	868,182
Property, plant and equipment, net	79,709	80,516
Long-term investments	10,157	12,158
Goodwill	150,340	150,733
Intangible assets, net	13,750	11,561
Other assets	12,807	11,692
Total assets	1,125,408	1,134,842
Current liabilities:
Short-term borrowings	759
Accounts payable	21,159	16,803
Accrued compensation	17,621	20,955
Income taxes payable	3,151	4,148
Other current liabilities	34,042	37,405
Total current liabilities	76,732	79,311
Other liabilities	45,613	43,375
Commitments and contingencies (Note 17)
Stockholders' equity:
Preferred Stock, $0.01 par value per share, 2,000,000 shares authorized; none issued and outstanding
Common Stock, no par value, 200,000,000 shares authorized; 52,794,736 and 52,748,849 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	113	113
Additional paid-in capital	719,782	718,005
Retained earnings	275,058	278,583
Accumulated other comprehensive income	8,110	15,455
Total stockholders' equity	1,003,063	1,012,156
Total liabilities and stockholders' equity	$ 1,125,408	$ 1,134,842