Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 12,740	$ 14,570
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,158	4,788
Stock-based compensation	2,407	2,940
Provision for doubtful accounts	866	717
Deferred income tax provision	870	870
Changes in:
Accounts receivable	(3,473)	(10,304)
Inventories	(5,278)	1,285
Prepaid expenses and other current assets	(2,205)	(111)
Other assets	(790)	(2,830)
Accounts payable	1,957	1,340
Accrued expenses	(4,122)	(10,672)
Deferred tuition revenue	6,053	3,031
Deferred revenue	4,996	8,496
Deferred rent	84	(249)
Gift certificate liability	(935)	(730)
Net cash provided by operating activities	18,328	13,141
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(3,792)	(4,271)
Post-closing working capital adjustments related to acquisitions		3,614
Net cash used in investing activities	(3,792)	(657)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of treasury shares	(2,554)	(808)
Payments for long-term debt	(16,188)	(14,125)
Proceeds from share option exercises		354
Net cash used in financing activities	(18,742)	(14,579)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	788	(344)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(3,418)	(2,439)
CASH AND CASH EQUIVALENTS, Beginning of period	75,028	62,645
CASH AND CASH EQUIVALENTS, End of period	71,610	60,206
Cash paid during the period for:
Interest	1,052	1,318
Income taxes	$ 1,112	$ 1,962