Discontinued Operations and Held For Sale (HealthTronics) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 28, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilities held for sale		$ 24,338,000	$ 20,215,000
Healthtronics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Upfront cash payment					$ 85,000,000
Additional cash payments				$ 4,700,000
Net gain from disposal of discontinued operation	$ 3,600,000
Revenue	14,443,000
Loss from discontinued operations before income taxes	6,434,000
Income tax expense	757,000
Discontinued operations, net of tax	$ 5,677,000
Assets held for sale		0	0
Liabilities held for sale		$ 0	$ 0