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 holding gain arising during the period, tax effect	$ 0	$ 215	$ 115
Reclassification adjustment for gains included in net income, tax effect	0	330	0
Interest rate swap, tax effect	(1,164)	696	451
Foreign currency translation adjustment, tax effect	$ 5	$ 15	$ 44