Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities
Consolidated net income	$ 46,723	$ 92,109
Adjustments to reconcile consolidated net income to net cash flows from operating activities:
Depreciation and amortization	40,336	33,858
Deferred income taxes	(5,367)	(2,315)
Stock-based compensation expense	13,253	11,153
Provision for bad debt	308	730
Equity in net income of unconsolidated entities	(1,433)	(1,172)
Excess tax benefits from stock-option exercises and vesting of restricted stock units	(2,945)	(4,093)
Holding gain upon acquisition of additional ownership of equity method investments	(5,168)	(3,635)
Other, net	200	12
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(12,588)	(1,249)
Other assets	(3,333)	(2,887)
Accounts payable and accrued liabilities	(1,224)	(3,151)
Accrued compensation	3,376	(8,404)
Income taxes- current	3,542	17,205
Deferred revenue	548	6,004
Deferred rent	33	(1,273)
Other liabilities	(973)	(679)
Cash provided by operating activities	75,288	132,213
Investing activities
Purchases of investments	(10,612)	(113,824)
Proceeds from maturities and sales of investments	103,120	108,599
Capital expenditures	(42,756)	(27,950)
Acquisitions, net of cash acquired	(64,447)	(11,079)
Proceeds from sale of a business	0	957
Purchases of equity- and cost-method investments	0	(2,751)
Other, net	229	432
Cash used for investing activities	(14,466)	(45,616)
Financing activities
Proceeds from stock-option exercises, net	3,766	3,172
Employee taxes withheld for restricted stock units	(5,122)	(5,276)
Excess tax benefits from stock-option exercises and vesting of restricted stock units	2,945	4,093
Common shares repurchased	(42,100)	(62,794)
Dividends paid	(22,912)	(11,657)
Proceeds from short-term debt	30,000	0
Other, net	(9)	(54)
Cash provided by (used for) financing activities	(33,432)	(72,516)
Effect of exchange rate changes on cash and cash equivalents	(6,232)	(1,011)
Net increase (decrease) in cash and cash equivalents	21,158	13,070
Cash and cash equivalents-beginning of period	168,160	163,889
Cash and cash equivalents-end of period	189,318	176,959
Supplemental disclosure of cash flow information:
Cash paid for income taxes	22,044	27,700
Supplemental information of non-cash investing and financing activities:
Unrealized gain (loss) on available-for-sale investments	(270)	1,675
Equipment obtained under long-term financing arrangement	$ 0	$ 4,860