CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Unrealized gains on available-for-sale securities, taxes	$ 208	$ 177	$ 174
Reclassification adjustment for gains on available-for-sale securities included in net income, taxes	0	0	379
Unfunded pension liability, taxes	$ 123	$ 231	$ 58