Income Taxes From Continuing Operations (Scheduling of Income from Continuing Operations Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Components of income taxes, U.S. operations	$ 121,940	$ 188,473	$ 259,057
Components of income taxes, foreign operations	1,125	2,368	3,341
Income from continuing operations before income taxes	$ 123,065	$ 190,841	$ 262,398