Annual report pursuant to Section 13 and 15(d)

Income Taxes (Consolidated Income from Continuing Operations Before Income Taxes) (Details)

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Income Taxes (Consolidated Income from Continuing Operations Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. operations $ 167,380 $ 173,798 $ 173,966
Foreign operations 99,354 83,100 73,353
Income before income tax $ 266,734 $ 256,898 $ 247,319