Lines of Credit and Financing Arrangements (Details Textual 3) (Senior Notes [Member], USD $)	3 Months Ended
	Mar. 31, 2014	May 31, 2010
Senior Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes		$ 200,000,000
Fixed interest rate for senior unsecured notes	4.90%
Maturity date of senior unsecured notes	May 15, 2017
Minimum principal amount accelerated	$ 75,000,000.0
Notice Date	30 days