Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 100,808	$ 128,763
Trade accounts receivable, net of allowances of $6,978 and $7,322	118,129	106,005
Inventories, net	171,261	146,928
Deferred tax assets	36,155	35,284
Prepaid expenses and other current assets	25,904	27,869
Total current assets	452,257	444,849
Property, plant and equipment, net	131,383	99,456
Intangible assets, net	237,122	194,904
Goodwill	292,980	261,928
Deferred tax assets	17,239	7,894
Other assets	13,128	10,102
Total assets	1,144,109	1,019,133
Current Liabilities:
Borrowings under senior credit facility		108,438
Accounts payable, trade	27,656	27,783
Deferred revenue	4,543	4,444
Accrued compensation	28,010	27,562
Accrued expenses and other current liabilities	41,659	33,630
Total current liabilities	101,868	201,857
Long-term borrowings under senior credit facility	179,688	139,688
Long-term convertible securities	352,576	155,154
Deferred tax liabilities	5,726	10,645
Other liabilities	11,613	11,826
Total liabilities	651,471	519,170
Commitments and contingencies
Stockholders' Equity:
Preferred Stock; no par value; 15,000 authorized shares; none outstanding
Common stock; $.01 par value; 60,000 authorized shares; 35,734 and 35,527 issued	357	355
Additional paid-in capital	607,676	552,231
Treasury stock, at cost; 8,903 and 6,994 shares	(367,121)	(283,658)
Accumulated other comprehensive income (loss):
Foreign currency translation adjustment	(6,494)	(870)
Pension liability adjustment, net of tax	(131)	(771)
Unrealized (loss) gain on derivatives, net of tax	(2,468)	(154)
Retained earnings	260,819	232,830
Total stockholders' equity	492,638	499,963
Total liabilities and stockholders' equity	$ 1,144,109	$ 1,019,133