Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Financial Instruments [Abstract]

Schedule of Long-Term Debt

(in thousands, except interest rates)	2012	2011
Convertible notes, par value $28,437, issued in March 2006 with fixed contractual interest rates of 2.25%, due in 2026	$28,261	$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 3.92% in 2012 and 3.61% in 2011, due in 2015	132,000	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% in 2011, due in varying amounts through 2021	8,892	10,160
Long-term debt	319,153	374,388
Less: current portion	(83,276)	(1,263)
Long-term debt, net of current portion	$235,877	$373,125