Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Financial Instruments [Abstract]

Schedule of Long-Term Debt

Long-term debt, principally to banks and bondholders, consists of:

(in thousands, except interest rates)	2011	2010
Convertible notes, par value $28,437, issued in March 2006 with fixed contractual interest rates of 2.25%, due in 2026	$27,228	$26,474
Private placement with a fixed interest rate of 6.84%, due in 2013 through 2017	150,000	150,000
Credit agreement with borrowings outstanding at an end of period interest rate of 3.61% in 2011 and 3.55% in 2010, due in 2015	187,000	237,000
Various notes and mortgages relative to operations principally outside the United States, at an average end of period rate of 3.05% in 2011 and 3.04% in 2010, due in varying amounts through 2021	10,160	10,172
Long-term debt	374,388	423,646
Less: current portion	(1,263)	(12)
Long-term debt, net of current portion	$373,125	$423,634