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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (15,203) $ 52,076
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:    
Goodwill and asset impairment 157 83
Depreciation and amortization expense 19,295 20,106
Bad debt expense 6,702 9,390
Compensation expense related to share-based awards 1,775 2,780
Loss on pending sale of business 6,712  
Loss on disposition of property and equipment 94 32
Changes in operating assets and liabilities (33,729) (67,115)
Net cash (used in) provided by operating activities (14,197) 17,352
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of available-for-sale investments (13,540) (40,300)
Sales of available-for-sale investments 13,465 40,438
Purchases of property and equipment (4,077) (12,303)
Payments of cash upon sale of business (1,947)  
Other (1) (12)
Net cash used in investing activities (6,100) (12,177)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Purchase of treasury stock   (56,431)
Issuance of common stock 304 477
Payments of contingent consideration   (3,555)
Payment on borrowings (80,000)  
Change in restricted cash 86,470  
Payments of capital lease obligations (74) (547)
Net cash provided by (used in) financing activities 6,700 (60,056)
EFFECT OF FOREIGN CURRENCY EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS: (3,194) 3,677
NET DECREASE IN CASH AND CASH EQUIVALENTS (16,791) (51,204)
DISCONTINUED OPERATIONS CASH ACTIVITY INCLUDED ABOVE:    
Add: Cash balance of discontinued operations, beginning of the period 63  
Less: Cash balance of discontinued operations, end of the period 15  
CASH AND CASH EQUIVALENTS, beginning of the period 240,559 280,592
CASH AND CASH EQUIVALENTS, end of the period $ 223,816 $ 229,388