Contingencies (Details Textual) (USD $)	1 Months Ended	6 Months Ended											1 Months Ended			1 Months Ended
	Dec. 31, 2010	Jun. 30, 2012	Dec. 31, 2011	May 31, 2011	Mar. 31, 2012 Cybex [Member]	Dec. 07, 2010 Cybex [Member]	Jun. 30, 2012 Accrued Liabilities [Member]	Dec. 31, 2011 Accrued Liabilities [Member]	Jun. 30, 2012 Other Long-Term Liabilities [Member]	Dec. 31, 2011 Other Long-Term Liabilities [Member]	Jun. 30, 2012 Other Assets [Member]	Dec. 31, 2011 Other Assets [Member]	Mar. 31, 2012 Plaintiff [Member]	Jan. 31, 2011 Plaintiff [Member]	Dec. 07, 2010 Plaintiff [Member]	Apr. 30, 2011 Barnhard [Member]	Dec. 31, 2010 Barnhard [Member]	Jun. 30, 2012 Barnhard [Member]	Apr. 30, 2011 Co-Defendant Amherst Orthopedic Physical Therapy [Member]	Dec. 07, 2010 Co-Defendant Amherst Orthopedic Physical Therapy [Member]	Jun. 30, 2012 Claims Made Prior to December 1, 2008 [Member]	Jun. 30, 2012 Claims Made on or After December 1, 2008 [Member]	Jun. 30, 2012 Claims made on or after December 1, 2011 [Member]	Jun. 30, 2012 Claims made on or after December 1, 2008 and before December 1, 2011 [Member]	Jun. 30, 2012 Claims between December 1, 2007 and December 1, 2008 [Member]
Contingencies (Textual) [Abstract]
Amount of verdict	$ 44,000,000	$ 18,500,000											$ 18,500,000	$ 938,000			$ 66,000,000
Verdict amount percentage						75.00%									5.00%					20.00%
Payments for legal settlements																63,075,000
Reimbursement percentage																			21.00%
Aggregate collateral amount				10,000,000
Litigation Settlement Additional Amount					1,000,000
Net present value of the future amounts payable to the plaintiff		849,000					144,000		705,000
Annual coverage amount for claims																					5,000,000		25,000,000	10,000,000
Deductible amount from policies per claim																					250,000				100,000
Annual aggregate deductible from policies																					750,000	1,000,000
Product Liability Contingency Annual Insurance Coverage																		5,000,000
Product liability accrual							1,760,000	1,934,000	383,000	859,000	383,000	859,000
Litigation reserve, current			27,004,000
Litigation related receivable			$ 7,561,000