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Income Taxes (Schedule Of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Liabilities, Net, Classification [Abstract]    
Gross assets $ 70,106 $ 69,287
Gross liabilities (118,586) (117,947)
Net deferred income tax assets and liabilities (48,480) (48,660)
Valuation allowance (14,548) (16,509)
Net deferred income tax liability $ (63,028) $ (65,169)