Other Long-Term Obligations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Deferred income taxes	$ 31,583,000		$ 31,583,000		$ 32,115,000
Convertible debt conversion liability	20,901,000		20,901,000		0
Product liability	16,030,000		16,030,000		14,582,000
Pension	10,390,000		10,390,000		9,868,000
Deferred gain on sale leaseback	6,773,000		6,773,000		6,978,000
Supplemental Executive Retirement Plan liability	4,826,000		4,826,000		4,930,000
Deferred compensation	4,130,000		4,130,000		4,167,000
Uncertain tax obligation including interest	3,383,000		3,383,000		4,467,000
Other	4,931,000		4,931,000		5,482,000
Other Long-Term Obligations	102,947,000		102,947,000		$ 82,589,000
Sale Leaseback Transaction, Deferred Gain, Gross	7,414,000		7,414,000
Sale Leaseback Transaction, Current Period Gain Recognized	$ 67,000	$ 67,000	$ 198,000	$ 109,000