Short-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012
Debt Disclosure [Abstract]
Short-term debt	$ 4,320		$ 5,267
Interest rate, minimum	1.20%	1.90%
Interest rate, maximum	2.40%	2.90%
Interest rate, weighted average	2.20%		2.70%