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Income Taxes Income Taxes (Table 4) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current deferred tax assets: [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts $ 8,702 $ 7,315
Deferred Tax Assets, Inventory 2,274 901
Deferred Tax Assets, Unrealized Losses on Trading Securities 282 321
Deferred Tax Assets, Other Tax Carryforwards 647 300
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 1,113 1,796
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 10,217 11,071
Deferred Tax Assets, Other 1,557 3,842
Deferred Tax Assets, Gross 29,049 29,283
Valuation Allowance (649) 0
Non-current deferred tax assets (liabilities): [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment (13,009) (16,210)
Deferred Tax Liabilities, Undistributed Foreign Earnings (2,597) (2,422)
Deferred Tax Liabilities, Gross (23,120) (26,515)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent 4,257 3,737
Deferred Tax Liabilities, Goodwill (7,514) (7,883)
Deferred Tax Assets, Net 5,280 2,768
Deferred Tax Assets, Net of Valuation Allowance $ 28,400 $ 29,283