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Income Taxes Income Taxes (Table 4) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current deferred tax assets: [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts $ 9,005 $ 7,246
Deferred Tax Assets, Inventory 1,588 1,975
Deferred Tax Assets, Unrealized Losses on Trading Securities 58 (6)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 496 496
Deferred Tax Assets, Other (74) 595
Deferred Tax Assets, Gross, Current 11,073 10,306
Deferred Tax Assets, Valuation Allowance 0 (595)
Deferred taxes 11,073 9,711
Non-current deferred tax assets (liabilities): [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment (1,982) (1,889)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits 8,200 4,902
Deferred Tax Liabilities, Undistributed Foreign Earnings (10,224) 0
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent 2,991 2,388
Deferred Tax Liabilities, Goodwill (3,097) (2,504)
Deferred Tax Liabilities, Unrealized Gains on Trading Securities (1,073) (561)
Deferred Tax Liabilities, Other 68 92
Deferred Tax Assets, Net, Noncurrent (5,117) 2,428
Deferred Tax Assets, Net of Valuation Allowance $ 5,956 $ 12,139