CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 15,033	$ 19,211
Restricted cash	3,120	3,120
Accounts receivable, less allowance for doubtful accounts of $21,295 and $21,379 in 2013 and 2012, respectively	156,813	165,668
Inventories	132,492	127,295
Prepaid expenses, other assets, and income taxes receivable	19,791	15,673
Deferred income taxes	28,043	27,685
Total current assets	355,292	358,652
PROPERTY, PLANT AND EQUIPMENT
Land	794	794
Buildings	8,896	8,896
Furniture and fixtures	19,789	19,582
Machinery and equipment	60,887	60,364
Equipment leased to third parties under operating leases	34,869	34,827
Leasehold improvements	76,141	74,615
Computer and software	100,712	98,186
Total property, plant and equipment, gross	302,088	297,264
Less accumulated depreciation	190,187	182,803
Total property, plant and equipment, net	111,901	114,461
INTANGIBLE ASSETS
Goodwill	674,416	674,774
Patents and other intangible assets, less accumulated amortization of $22,312 and $20,643 in 2013 and 2012, respectively	62,661	64,281
Total intangible assets, net	737,077	739,055
OTHER ASSETS
Debt issuance costs, net	13,169	14,033
Other assets	11,482	11,126
Total other assets	24,651	25,159
TOTAL ASSETS	1,228,921	1,237,327
CURRENT LIABILITIES
Current portion of long-term debt	11,528	11,082
Accounts payable	26,345	28,923
Accrued expenses	23,089	22,357
Accrued interest payable	6,516	3,041
Accrued compensation related costs	22,134	41,784
Total current liabilities	89,612	107,187
LONG-TERM LIABILITIES
Long-term debt, less current portion	506,958	509,564
Deferred income taxes	77,730	77,730
Other liabilities	38,989	39,752
Total liabilities	713,289	734,233
COMMITMENTS AND CONTINGENCIES (Note H)
SHAREHOLDERS' EQUITY
Common stock, $.01 par value; 60,000,000 shares authorized, 35,937,455 and 35,617,884 shares issued and outstanding at 2013 and 2012, respectively	359	356
Additional paid-in capital	283,130	280,084
Accumulated other comprehensive loss	(1,919)	(1,919)
Retained earnings	234,718	225,229
Shareholders' equity, excluding treasury stock	516,288	503,750
Treasury stock at cost (141,154 shares)	(656)	(656)
Total shareholders' equity	515,632	503,094
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,228,921	$ 1,237,327