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Income Taxes Income Taxes (Table 4) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current deferred tax assets: [Abstract]    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts $ 7,315 $ 8,800
Deferred Tax Assets, Inventory 901 2,202
Deferred Tax Assets, Unrealized Losses on Trading Securities 321 177
Deferred Tax Assets, Other Tax Carryforwards 300 1,172
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities 1,796 751
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation 11,071 17,569
Deferred Tax Assets, Other 3,842 3,515
Deferred Tax Assets, Gross 29,283 39,513
Non-current deferred tax assets (liabilities): [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment (16,210) (19,264)
Deferred Tax Liabilities, Undistributed Foreign Earnings (2,422) (31,262)
Deferred Tax Liabilities, Gross (26,515) (57,166)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent 3,737 5,327
Deferred Tax Liabilities, Goodwill (7,883) (6,640)
Deferred Tax Assets, Net, Noncurrent 6,370 1,813
Deferred Tax Assets, Net of Valuation Allowance $ 2,768 $ (17,653)