Business Segments (Information by Segment) (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Restructuring Reserve	$ 2,910,000	$ 5,639,000	$ 3,201,000		$ 2,910,000		$ 2,169,000
Net Sales	250,906,000			$ 268,145,000	716,146,000	$ 800,734,000
Charges	(703,000)	(4,987,000)	(3,283,000)	(508,000)	(8,973,000)	(1,299,000)
Operating Income (Loss)	(5,884,000)			2,615,000	(32,221,000)	(8,277,000)
Loss (gain) on Convertible Debt Derivatives	(2,550,000)			1,192,000	(2,700,000)	2,282,000
Interest Revenue (Expense), Net	(6,707,000)			(4,402,000)	(15,733,000)	(11,021,000)
Earnings (loss) before income taxes	(15,141,000)			(595,000)	(50,654,000)	(17,016,000)
Europe (1)
Segment Reporting Information [Line Items]
Net Sales	143,281,000			141,738,000	391,274,000	399,504,000
Charges	(686,000)			0	(1,890,000)	0
Operating Income (Loss)	11,987,000			11,638,000	24,164,000	24,550,000
NA/HME (1)
Segment Reporting Information [Line Items]
Restructuring Reserve	1,438,000	3,938,000	1,561,000		1,438,000		903,000
Restructuring Reserve, Accrual Adjustment	(170,000)
Net Sales	79,516,000			99,323,000	241,467,000	317,695,000
Net sales				1,300,000		3,738,000
Charges		(3,928,000)	(2,242,000)	(490,000)	(6,000,000)	(1,213,000)
Operating Income (Loss)	(12,446,000)			(11,007,000)	(34,267,000)	(24,065,000)
Operating Income (Loss)				15,000		165,000
IPG
Segment Reporting Information [Line Items]
Net Sales	13,975,000			15,343,000	45,668,000	49,702,000
Operating Income (Loss)	1,202,000			1,497,000	4,572,000	4,453,000
Asia/Pacific
Segment Reporting Information [Line Items]
Net Sales	14,134,000			11,741,000	37,737,000	33,833,000
Charges	(187,000)			(18,000)	(1,083,000)	(86,000)
Operating Income (Loss)	387,000			(559,000)	(161,000)	(1,599,000)
All Other
Segment Reporting Information [Line Items]
Restructuring Reserve	1,017,000	1,017,000	1,017,000		1,017,000		1,266,000
Operating Income (Loss)	(6,311,000)			(5,832,000)	(17,556,000)	(17,703,000)
Europe
Segment Reporting Information [Line Items]
Restructuring Reserve			500,000
Europe [Member]
Segment Reporting Information [Line Items]
Restructuring Reserve	444,000	674,000			444,000
Asia/Pacific
Segment Reporting Information [Line Items]
Restructuring Reserve	11,000	10,000	123,000		11,000
Charges	(187,000)	(545,000)
Intersegment revenues
Segment Reporting Information [Line Items]
Net Sales	27,066,000			33,240,000	87,123,000	104,543,000
Intersegment revenues | Europe (1)
Segment Reporting Information [Line Items]
Net Sales	4,013,000			3,240,000	11,426,000	10,292,000
Intersegment revenues | NA/HME (1)
Segment Reporting Information [Line Items]
Net Sales	19,334,000			24,339,000	62,479,000	77,248,000
Intersegment revenues | IPG
Segment Reporting Information [Line Items]
Net Sales	314,000			998,000	2,057,000	2,201,000
Intersegment revenues | Asia/Pacific
Segment Reporting Information [Line Items]
Net Sales	3,405,000			$ 4,663,000	11,161,000	14,802,000
Severance
Segment Reporting Information [Line Items]
Restructuring Reserve	2,814,000	5,156,000	3,030,000		2,814,000		2,049,000
Charges	(792,000)	(4,486,000)	(3,136,000)
Severance | NA/HME (1)
Segment Reporting Information [Line Items]
Restructuring Reserve	1,342,000	3,455,000	1,390,000		1,342,000		783,000
Restructuring Reserve, Accrual Adjustment	(81,000)
Charges		(3,427,000)	(2,095,000)		(5,441,000)	(808,000)
Severance | Asia/Pacific
Segment Reporting Information [Line Items]
Charges			(351,000)		(1,083,000)	(86,000)
Severance | All Other
Segment Reporting Information [Line Items]
Restructuring Reserve	1,017,000	1,017,000	1,017,000		1,017,000		1,266,000
Severance | Europe
Segment Reporting Information [Line Items]
Restructuring Reserve			500,000
Charges	(686,000)	(514,000)	(690,000)
Severance | Europe [Member]
Segment Reporting Information [Line Items]
Restructuring Reserve	444,000	674,000			444,000
Charges	(686,000)	(514,000)	(690,000)		(1,890,000)
Severance | Asia/Pacific
Segment Reporting Information [Line Items]
Restructuring Reserve	11,000	10,000	123,000		11,000
Charges	(187,000)	(545,000)	(351,000)
Contract Termination
Segment Reporting Information [Line Items]
Restructuring Reserve	96,000	483,000	171,000		96,000		120,000
Restructuring Reserve, Accrual Adjustment	(89,000)
Charges		(501,000)	(147,000)
Contract Termination | NA/HME (1)
Segment Reporting Information [Line Items]
Restructuring Reserve	96,000	483,000	171,000		96,000		120,000
Restructuring Reserve, Accrual Adjustment	(89,000)
Charges		(501,000)	(147,000)		(559,000)	$ (405,000)
Contract Termination | All Other
Segment Reporting Information [Line Items]
Restructuring Reserve	0	0	0		0		$ 0
Contract Termination | Europe
Segment Reporting Information [Line Items]
Restructuring Reserve			0
Charges	0	0	0
Contract Termination | Europe [Member]
Segment Reporting Information [Line Items]
Restructuring Reserve	0	0			0
Contract Termination | Asia/Pacific
Segment Reporting Information [Line Items]
Restructuring Reserve	0	0	0		$ 0
Charges	$ 0	$ 0	$ 0