Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities
Net income	$ 43,557	$ 39,182
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	21,120	20,973
Amortization of other intangible assets	1,816	1,104
Loss on asset disposals and impairments of property and equipment	2,096	1,534
Deferred income taxes	(2,022)	(260)
Equity in net income of affiliate	(671)	(631)
Distributions from affiliate	6,375	6,200
Bad debt expense	1,290	1,555
Non-cash share-based compensation	6,779	5,860
Changes in operating assets and liabilities
Trade accounts receivable	1,087	9,335
Prepaid expenses and other assets	(890)	2,823
Accounts payable	212	730
Accrued expenses and other current liabilities	(9,546)	(8,657)
Deferred revenue	12,200	8,167
Other noncurrent liabilities	2,601	1,717
Net cash provided by operating activities	86,004	89,632
Cash flows from investing activities
Additions to property and equipment	(16,900)	(23,035)
Proceeds from sale of cost investment	1,466
Payments for business acquisitions, net of cash acquired		(10,553)
Net cash used in investing activities	(15,434)	(33,588)
Cash flows from financing activities
Proceeds from stock option exercises and stock purchase plan	4,075	2,783
Stock repurchases	(50,025)
Dividends paid to stockholders	(8,064)	(8,126)
Payments for deferred financing costs		(231)
Excess tax benefits realized from share-based awards	775	715
Debt borrowings		15,000
Debt repayments		(69,103)
Net cash used in financing activities	(53,239)	(58,962)
Effect of exchange rate changes on cash and cash equivalents	5	(22)
Net change in cash and cash equivalents	17,336	(2,940)
Cash and cash equivalents at beginning of period	19,715	18,925
Cash and cash equivalents at end of period	$ 37,051	$ 15,985