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Income Taxes Income Taxes (Table 2) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current: [Abstract]      
Current Federal Tax Expense (Benefit) $ 32,880 $ 56,836 $ 47,655
Current State and Local Tax Expense (Benefit) 5,012 5,746 6,063
Current Foreign Tax Expense (Benefit) 11,771 10,773 3,270
Current Income Tax Expense (Benefit) 49,663 73,355 56,988
Deferred: [Abstract]      
Deferred Federal Income Tax Expense (Benefit) (2,489) (22,061) (7,050)
Deferred State and Local Income Tax Expense (Benefit) (200) 800 153
Deferred Foreign Income Tax Expense (Benefit) (133) 1,095 (365)
Deferred Income Tax Expense (Benefit) (2,822) (20,166) (7,262)
Provision for income taxes $ 46,841 $ 53,189 $ 49,726