Indebtedness (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Long-term debt, fair value	$ 136,452	$ 139,234
Short-term Debt	21,545	21,296
Line of Credit Facility [Line Items]
Available for future borrowings	149,098
Domestic Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount outstanding	29,000	9,000
Expiration date	Aug. 31, 2014
Available for future borrowings	116,000
Foreign Credit Facility [Member]
Line of Credit Facility [Line Items]
Available for future borrowings	33,098
6.83% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	$ 125,000
Stated interest rate (in hundredths)	6.83%
Maturity date	Aug. 12, 2020