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Income Taxes (Components Of Net Deferred Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Net operating loss carryforwards $ 15,822 $ 18,716  
Capital loss carryforwards 747 89  
Tax credits 1,817 1,497  
Allowance for doubtful accounts 600 521  
Accrued salaries and benefits 500 343  
Deferred revenues 809 503  
Capital leases 4,202 3,639  
Deferred compensation 7,167 4,366  
Deferred rent 3,275 3,386  
Other 654 1,304  
Gross deferred tax assets 35,593 34,364  
Valuation allowance (2,741) (1,027) (3,550)
Net deferred tax assets 32,852 33,337  
Intangible assets (4,774) (10,704)  
Property and equipment (4,907) (4,839)  
Prepaid maintenance (171) (445)  
Other (231) (208)  
Total deferred tax liabilities (10,083) (16,196)  
Net deferred tax asset $ 22,769 $ 17,141