CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in unrealized gains (losses) - taxes (benefits)	$ (13)	$ 31	$ (11)
Reclassification adjustment for net losses (gains) realized in net income - benefits (taxes)	(6)	(4)	(4)
Changes in market value of derivatives - taxes (benefits)	3	(20)	(58)
Reclassification adjustment for net losses (gains) realized in net income - benefits (taxes)	(2)	15	0
Actuarial gain (loss) on pension plans, tax benefit	$ 26	$ (5)	$ (11)