Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net income	$ 23,831	$ 17,547
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	13,983	12,931
Amortization of intangible assets	571	264
Loss on asset disposals and impairments	1,221	1,319
Loss due to retirement plan settlements		1,212
Reduced tax benefits on share-based awards		(25)
Deferred income taxes	(706)	(539)
Equity in net income of affiliate	(2,921)	(3,111)
Distributions from affiliate	4,050	4,650
Bad debt expense	930	60
Non-cash share-based compensation	3,831	3,102
Changes in operating assets and liabilities
Trade accounts receivable	327	(4,141)
Prepaid expenses and other assets	2,705	142
Accounts payable	250	(398)
Accrued expenses and other current liabilities	(6,998)	(6,457)
Deferred revenue	11,267	6,582
Other noncurrent liabilities	2,010	1,600
Net cash provided by operating activities	54,351	34,738
Cash flows from investing activities
Additions to property and equipment	(14,182)	(12,859)
License of other intangible assets		(4,500)
Purchases of equity and other investments		(1,780)
Payments for business acquisitions		(2,500)
Net cash used in investing activities	(14,182)	(21,639)
Cash flows from financing activities
Proceeds from stock option exercises and stock purchase plan	2,046	1,156
Dividends paid to stockholders	(5,408)	(5,312)
Tax benefits realized from share-based awards	484
Decrease in bank overdraft payables		(3,833)
Borrowings under Credit Facility	5,000	10,000
Payments under Credit Facility	(53,000)	(10,000)
Net cash used in financing activities	(50,878)	(7,989)
Effect of exchange rate changes on cash and cash equivalents	(1)	(1)
Net change in cash and cash equivalents	(10,710)	5,109
Cash and cash equivalents at beginning of period	18,925	8,217
Cash and cash equivalents at end of period	$ 8,215	$ 13,326