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Income Taxes (Deferred Tax Liabilities (Assets)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Depreciation $ 9,886 $ 9,563
Goodwill 35,813 32,662
Intangible assets 9,907 10,928
Foreign withholding tax 1,182 1,014
Other 696 652
Gross deferred tax liabilities 57,484 54,819
Equity compensation (10,420) (12,577)
Other (13,529) (13,247)
Gross deferred tax assets (23,949) (25,824)
Valuation allowances 2,995 2,242
Deferred tax assets, net of valuation allowances (20,954) (23,582)
Net deferred tax liabilities $ 36,530 $ 31,237