Income Taxes (Schedule of Earnings Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 500,757	$ 566,444	$ 384,853
Income (Loss) from Continuing Operations before Income Taxes, Foreign	(45,932)	16,350	12,175
Income from continuing operations before income taxes	$ 454,825	$ 582,794	$ 397,028