Income Taxes (Components of Income Taxes, Continuing and Discontinued Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense (benefit) from continuing operations	$ (535,005)	$ 40,728	$ 74,323
Income tax expense from discontinued operations	0	17,928	33,174
Income tax expense from gain on disposal of discontinued operations	0	285,497	2,011
Total income tax expense (benefit)	$ (535,005)	$ 344,153	$ 109,508