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Income Taxes Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Tax Examination [Line Items]      
INCOME TAX PROVISION $ 22,999,000 $ 16,210,000  
Pretax income $ 59,209,000 $ 39,833,000  
Effective income tax rate 38.84% 40.69%  
Unrecognized tax benefits     $ 2,200,000
Interest accrued $ 331,000   306,000
Penalties accrued 0   $ 0
Decrease in unrecognized tax benefits is reasonably possible 1,000,000    
Tax effects of issuance of shares from various stock plans 73,000    
Series of Individually Immaterial Business Acquisitions [Member]      
Income Tax Examination [Line Items]      
Interest accrued $ 100,000