CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 5,748	$ 6,639
Unrealized gain on marketable securities, net of tax	163	0
Interest rate swap, net of tax	0	191
Foreign currency translation adjustment, net of tax	114	322
Total other comprehensive income	277	513
Total comprehensive income	$ 6,025	$ 7,152