Income Taxes (Loss from Continuing Operations and Effective Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income tax	$ 25,252	$ (94,584)	$ 46,501	$ (96,293)
Income tax expense (benefit)	$ 7,642	$ 3,468	$ (128,690)	$ 14,371
Effective tax rate	30.30%	(3.70%)	(276.70%)	(14.90%)
Federal income tax expense (benefit), continuing operations			$ 127,900
Proceeds from income tax refunds					$ 760,000