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Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Components Of Income Tax Expense Benefit Continuing Operations [Abstract]    
Deferred compensation $ 74,916 $ 71,687
Receivable reserves 30,252 22,679
Net operating loss carryforwards 29,699 31,986
Accrued expenses 19,832 33,957
Unrealized loss on investments 10,635  
Depreciation   4,012
Other 3,066  
Total deferred tax assets 168,400 164,321
Valuation allowance (3,944) (4,285)
Deferred tax assets 164,456 160,036
Goodwill and other intangibles (42,045) (38,982)
Depreciation (6,629)  
Prepaid expenses (3,774) (2,834)
Unrealized gain on investments   (11,081)
Other   (1,987)
Total deferred tax liabilities (52,448) (54,884)
Net deferred tax asset $ 112,008 $ 105,152