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Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:                      
Federal                 $ 14,102 $ 14,529 $ 17,854
State                 1,206 1,289 930
Total                 15,308 15,818 18,784
Deferred:                      
Change in federal corporate income tax rate(1)                 0 14,263 0
Federal                 (2,541) 4,117 (1,258)
Deferred State and Local Income Tax Expense (Benefit)                 (61) (320) (54)
Deferred Income Tax Expense (Benefit)                 (2,602) 18,060 (1,312)
Income tax expense $ 3,502 $ 3,238 $ 2,887 $ 3,079 $ 19,335 $ 5,478 $ 4,721 $ 4,344 $ 12,706 $ 33,878 $ 17,472
[1] (1) In the fourth quarter of 2017, the Company recognized $14.3 million of additional income tax expense upon the revaluation of its deferred tax assets and liabilities upon enactment of the Tax Act on December 22, 2017, which lowered the federal corporate tax rate from 35.0% to 21.0%, effective January 1, 2018. The impact to fourth quarter 2017 basic and diluted EPS was $0.91 per share.