Other Long-Term Obligations (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Deferred income taxes	$ 30,355,000		$ 31,079,000
Convertible debt conversion liability	23,977,000		30,708,000
Product liability	14,407,000		16,615,000
Pension	13,429,000		13,258,000
Deferred gain on sale leaseback	6,633,000		6,703,000
Supplemental Executive Retirement Plan liability	5,576,000		5,612,000
Deferred compensation	3,719,000		3,593,000
Uncertain tax obligation including interest	2,897,000		3,150,000
Other	3,832,000		3,689,000
Other Long-Term Obligations	104,825,000		$ 114,407,000
Sale Leaseback Transaction, Deferred Gain, Gross	7,414,000
Sale Leaseback Transaction, Current Period Gain Recognized	$ 68,000	$ 66,000