Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrealized holding gains (losses) on available-for-sale securities, tax (expense) benefit	$ (2)	$ 4	$ 23
Unrealized gains (losses) on derivative transactions, tax (expense) benefit	9	(171)	(1,858)
Foreign currency translation adjustment, tax (expense) benefit	$ (191)	$ (59)	$ (315)