Business Segments - (Information by Segment) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 250,351,000	$ 250,906,000	$ 233,517,000	$ 231,723,000	$ 246,740,000	$ 268,145,000	$ 275,037,000	$ 257,552,000	$ 966,497,000	$ 1,047,474,000	$ 1,142,338,000
Depreciation and amortization									14,631,000	14,635,000	18,204,000
Net interest expense (income)									22,434,000	15,610,000	3,971,000
Operating Income (Loss)									(40,159,000)	(15,215,000)	(7,769,000)
Restructuring Charges, Net of Inventory Adjustments									(12,274,000)	(2,447,000)	(1,971,000)
Gain on sale of business (pre-tax)						(7,386,000)			0	7,386,000	24,000
Asset write-downs to intangible assets									(320,000)	0	0
Loss (gain) on Convertible Debt Derivatives	(957,000)	$ (2,550,000)	$ (1,051,000)	$ (901,000)	(1,014,000)	$ (1,192,000)	$ (486,000)		(3,657,000)	1,268,000	0
Interest Revenue (Expense), Net									(22,434,000)	(15,610,000)	(3,971,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(66,250,000)	(29,557,000)	(11,740,000)
Assets	1,066,033,000				903,743,000				1,066,033,000	903,743,000	838,143,000
Long-lived assets	609,119,000				494,671,000				609,119,000	494,671,000	475,844,000
Expenditures for assets									14,569,000	10,151,000	7,522,000
North America/HME
Segment Reporting Information [Line Items]
Depreciation and amortization									5,452,000	5,956,000	7,556,000
Net interest expense (income)									21,729,000	15,119,000	3,305,000
Operating Income (Loss)									(42,831,000)	(37,876,000)	(29,320,000)
Assets	349,137,000				265,092,000				349,137,000	265,092,000	205,724,000
Long-lived assets	142,238,000				70,585,000				142,238,000	70,585,000	49,169,000
Expenditures for assets									7,702,000	3,426,000	1,252,000
Institutional Products Group
Segment Reporting Information [Line Items]
Depreciation and amortization									293,000	254,000	1,980,000
Net interest expense (income)									277,000	191,000	1,028,000
Operating Income (Loss)									5,839,000	5,693,000	7,834,000
Assets	38,884,000				38,657,000				38,884,000	38,657,000	38,730,000
Long-lived assets	31,340,000				30,603,000				31,340,000	30,603,000	30,278,000
Expenditures for assets									53,000	58,000	212,000
Europe
Segment Reporting Information [Line Items]
Depreciation and amortization									7,446,000	7,038,000	7,176,000
Net interest expense (income)									229,000	197,000	(444,000)
Operating Income (Loss)									33,160,000	34,122,000	39,869,000
Assets	646,085,000				572,427,000				646,085,000	572,427,000	555,867,000
Long-lived assets	430,998,000				388,692,000				430,998,000	388,692,000	391,505,000
Expenditures for assets									5,819,000	5,552,000	5,038,000
Asia/Pacific
Segment Reporting Information [Line Items]
Depreciation and amortization									1,420,000	1,349,000	1,463,000
Net interest expense (income)									199,000	103,000	82,000
Operating Income (Loss)									(27,000)	(1,436,000)	(3,493,000)
Assets	29,922,000				25,703,000				29,922,000	25,703,000	24,421,000
Long-lived assets	2,538,000				2,927,000				2,538,000	2,927,000	3,140,000
Expenditures for assets									995,000	1,115,000	969,000
All Other
Segment Reporting Information [Line Items]
Depreciation and amortization									20,000	38,000	29,000
Operating Income (Loss)									(23,706,000)	(20,657,000)	(20,712,000)
Assets	2,005,000				1,864,000				2,005,000	1,864,000	1,752,000
Long-lived assets	2,005,000				1,864,000				2,005,000	1,864,000	1,752,000
Expenditures for assets									0	0	51,000
Discontinued Operations
Segment Reporting Information [Line Items]
Assets	$ 0				$ 0				0	0	11,649,000
Operating Segments | North America/HME
Segment Reporting Information [Line Items]
Net sales									320,818,000	402,914,000	475,287,000
Operating Segments | Institutional Products Group
Segment Reporting Information [Line Items]
Net sales									59,472,000	64,413,000	87,137,000
Operating Segments | Europe
Segment Reporting Information [Line Items]
Net sales									535,326,000	534,801,000	535,372,000
Operating Segments | Asia/Pacific
Segment Reporting Information [Line Items]
Net sales									50,881,000	45,346,000	44,542,000
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									113,926,000	133,183,000	142,937,000
Intersegment Eliminations | North America/HME
Segment Reporting Information [Line Items]
Net sales									82,716,000	96,750,000	111,321,000
Intersegment Eliminations | Institutional Products Group
Segment Reporting Information [Line Items]
Net sales									2,083,000	2,885,000	997,000
Intersegment Eliminations | Europe
Segment Reporting Information [Line Items]
Net sales									13,815,000	14,182,000	9,958,000
Intersegment Eliminations | Asia/Pacific
Segment Reporting Information [Line Items]
Net sales									$ 15,312,000	$ 19,366,000	$ 20,661,000