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Prepaid Expenses and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Prepaid expenses and other current assets    
Current deferred tax asset $ 31,426 $ 16,713
Restricted cash 17,994 21,472
Prepaid vehicle licenses 47,045 41,237
Prepaid operating taxes 12,477 11,476
Prepaid real estate rent 7,030 7,768
Prepaid contract incentives 5,612 6,861
Prepaid software maintenance costs 3,490 2,647
Prepaid benefits 465 2,260
Prepaid insurance 14,003 8,324
Prepaid sales commissions 9,385 4,421
Other 14,118 13,365
Total $ 163,045 $ 136,544