Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement Parentheticals [Abstract]
Change in employee benefit plan liability, tax	$ (1,304)	$ 1,339	$ 1,161
Amortization of non-qualified employee benefit plan liability, tax	$ (608)	$ (434)	$ (383)