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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (48,158) $ 128,388
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Goodwill and asset impairment 85,661 2,676
Depreciation and amortization expense 40,126 40,873
Bad debt expense 17,779 26,834
Compensation expense related to share-based awards 5,735 8,488
Loss (gain) on disposition of property and equipment 287 (1,777)
Changes in operating assets and liabilities (84,853) (90,730)
Net cash provided by operating activities 16,577 114,752
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of available-for-sale investments (108,198) (110,162)
Sales of available-for-sale investments 108,188 109,894
Purchases of property and equipment (19,990) (47,886)
Earnout payments (5,818) (8,509)
Proceeds on the sale of assets   6,259
Business acquisition, net of acquired cash (2,873)  
Other (120) 46
Net cash used in investing activities (28,811) (50,358)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Purchase of treasury stock (56,431) (129,879)
Issuance of common stock 883 3,025
Tax benefit associated with stock option exercises   322
Payments of assumed loans upon business acquisition (318)  
Payments of capital lease obligations (641) (744)
Net cash used in financing activities (56,507) (127,276)
EFFECT OF FOREIGN CURRENCY EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: (2,539) 2,221
NET DECREASE IN CASH AND CASH EQUIVALENTS DISCONTINUED OPERATIONS CASH ACTIVITY INCLUDED ABOVE: (71,280) (60,661)
Add: Cash balance of discontinued operations, beginning of the period   28,838
Less: Cash balance of discontinued operations, end of the period   19,908
CASH AND CASH EQUIVALENTS, beginning of the period 280,592 260,644
CASH AND CASH EQUIVALENTS, end of the period $ 209,312 $ 208,913