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Income Taxes (Schedule of Income Taxes Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income tax at federal statutory rate $ 40,394 $ 74,495 $ 69,710
State income tax, net of federal income tax impact 6,261 6,011 6,480
Foreign tax rate differential (598) (322) (614)
Section 162(m) permanent addback 894 0 0
Domestic production deduction 0 (5,511) (5,067)
Share-based payment compensation excess tax benefit (2,914) (7,683) 0
Federal tax credits (1,876) (1,110) (1,736)
Changes in tax law (TCJA) 612 13,210 0
Other 1,028 870 728
Provision for income taxes $ 43,801 $ 79,960 $ 69,501