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]
Foreign currency translation adjustment, tax	$ (1,076)	$ (951)	$ (1,828)
Net change in derivative fair value, tax	$ 0	$ 0	$ 1,578