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Income Taxes (Deferred Tax Liabilities (Assets)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Depreciation $ 17,367 $ 18,667
Goodwill 43,562 36,058
Intangible assets 14,731 19,291
Other 892 1,742
Deferred Tax Liabilities, Gross 76,552 75,758
Equity compensation (21,439) (13,023)
Other (18,473) (20,847)
Gross deferred tax assets (39,912) (33,870)
Valuation allowances 1,362 766
Deferred tax assets, net of valuation allowances (38,550) (33,104)
Gross deferred tax liabilities $ 38,002 $ 42,654