Income Taxes (Reconciliation of Statutory Rate to Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Continuing operations:
Provisions using statutory federal income tax rate	$ 31,340	$ 53,175	$ 52,317
State income taxes (benefit), net of federal tax benefit	1,915	(776)	1,161
REIT Benefit	(19,992)	(43,554)	(41,479)
Change in valuation allowance	(1,245)	2,055	243
Federal tax credits	(1,904)	(2,016)	(2,038)
Tax Cut and Jobs Act Impact	(301)	9,584	0
Other, net	4,304	(510)	(2,300)
Total provision for income taxes	$ 14,117	$ 17,958	$ 7,904