Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reasons For The Difference Between Provision For Income Taxes) (Details)

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Income Taxes (Reasons For The Difference Between Provision For Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]      
Income tax expense at statutory rate $ 24,466 $ 43,484 $ 41,824
Effect of state taxes, net of federal tax benefit 3,837 2,735 1,796
Effect of federal rate change, net of federal tax benefit (1,005) (47,722)  
Effect of state rate changes on net deferred liabilities 833 156 (1,253)
Change in valuation allowance (283) 275 (549)
Non-deductible items 1,182 460 317
Tax credits (489) (1,733) (515)
Income Tax Expense (Benefit), Total $ 28,541 $ (2,345) $ 41,620