Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Financial Instruments [Abstract]

Schedule of Long-Term Debt

(in thousands, except interest rates)	March 31, 2012	December 31, 2011
Convertible notes, par value $28,437, issued in March 2006 with fixed contractual interest rates of 2.25%, due in 2026	$27,632	$27,228
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 4.07% in 2012 and 3.61% in 2011,  due in 2015	139,000	187,000
Various notes and mortgages relative to operations principally outside the United States, at an average end of period rate of 3.06% in 2012 and 3.05% 2011, due in varying amounts through 2021	10,149	10,160
Long-term debt	326,781	374,388
Less: current portion	(30,145)	(1,263)
Long-term debt, net of current portion	$296,636	$373,125