Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities
Net income	$ 39,182	$ 28,875
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	20,973	19,787
Amortization of intangible assets	1,104	537
Loss on asset disposals and impairments	1,534	2,074
Loss due to retirement plan settlements		1,222
Reduced tax benefits on share-based awards		(178)
Deferred income taxes	(260)	1,784
Equity in net income of affiliate	(631)	(472)
Distributions from affiliate	6,200	6,700
Bad debt expense	1,555	405
Non-cash share-based compensation	5,860	4,710
Changes in operating assets and liabilities
Trade accounts receivable	9,335	(7,798)
Prepaid expenses and other assets	2,823	21
Accounts payable	730	(767)
Accrued expenses and other current liabilities	(8,657)	(11,434)
Deferred revenue	8,167	156
Other noncurrent liabilities	1,717	1,492
Net cash provided by operating activities	89,632	47,114
Cash flows from investing activities
Additions to property and equipment	(23,035)	(23,174)
License of other intangible assets		(4,500)
Purchases of equity and other investments		(1,780)
Payments for business acquisitions, net of cash acquired	(10,553)	(2,500)
Net cash used in investing activities	(33,588)	(31,954)
Cash flows from financing activities
Proceeds from stock option exercises and stock purchase plan	2,783	4,733
Dividends paid to stockholders	(8,126)	(7,981)
Payments for deferred financing costs	(231)
Tax benefits realized from share-based awards	715
Decrease in bank overdraft payables		(3,833)
Debt borrowings	15,000	10,000
Debt repayments	(69,103)	(20,000)
Net cash used in financing activities	(58,962)	(17,081)
Effect of exchange rate changes on cash and cash equivalents	(22)	9
Net change in cash and cash equivalents	(2,940)	(1,912)
Cash and cash equivalents at beginning of period	18,925	8,217
Cash and cash equivalents at end of period	$ 15,985	$ 6,305