Income Taxes (Schedule of Earnings Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 566,444	$ 384,853	$ 468,314
Income (Loss) from Continuing Operations before Income Taxes, Foreign	16,350	12,175	687
Income from continuing operations before income taxes	$ 582,794	$ 397,028	$ 469,001