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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred Tax Assets    
Tax net operating loss carryforwards $ 18,109 $ 17,620
Compensation related 13,130 13,499
Other 6,920 5,206
Total deferred tax assets 38,159 36,325
Valuation allowance (17,791) (17,224)
Total deferred tax asset, net of valuation allowance 20,368 19,101
Deferred Tax Liabilities    
Intangible assets 155,212 134,841
Property and equipment 7,882 8,319
Deferred sales commissions 5,270 6,499
State taxes 8,248 6,463
Other 714 1,604
Total gross deferred tax liability 177,326 157,726
Net deferred tax liability $ 156,958 $ 138,625