CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 67,753	$ 89,160
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	66,974	62,881
Non-cash impairment charges	52,564	0
Non-cash compensation expense associated with employee benefit and stock compensation plans	19,726	19,311
Deferred income tax benefit	(21,571)	(5,712)
Gain on sale of business	(1,648)	0
Gain on sale of investments	0	(16,400)
Loss on disposal of property and equipment	333	375
Changes in operating assets and liabilities, net of businesses sold and acquired:
Accounts receivable	(22,552)	(57,095)
Unbilled services	(20,575)	(17,467)
Inventory	(5,029)	1,323
Accounts payable	23,288	18,312
Accrued liabilities	(91,862)	(45,470)
Unearned revenue	(37,867)	(14,095)
Income taxes	17,504	6,736
Other assets and liabilities, net	(49,562)	(44,441)
Net cash used in operating activities	(2,524)	(2,582)
Cash flows from investing activities:
Capital expenditures	(73,023)	(68,433)
Acquisition of business, net of cash acquired	(8,403)	0
Proceeds from sale of business	8,429	0
Proceeds from sale of investments	0	17,781
Other, net	0	394
Net cash used in investing activities	(72,997)	(50,258)
Cash flows from financing activities:
Net borrowings under revolving credit facility	40,000	5,000
Stock issued under option plans	59,118	40,226
Purchase of treasury stock	(113,420)	(27,118)
Net cash (used in) provided by financing activities	(14,302)	18,108
Effect of exchange rate changes on cash	8,146	(12,492)
Net change in cash and cash equivalents	(81,677)	(47,224)
Cash and cash equivalents, beginning of period	617,686	492,824
Cash and cash equivalents, end of period	$ 536,009	$ 445,600