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Income Taxes (Reconciliation of Statutory Rate to Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Continuing operations:
Provisions using statutory federal income tax rate	$ 53,175	$ 52,317	$ 49,410
State income taxes (benefit), net of federal tax benefit	(776)	1,161	(322)
REIT Benefit	(43,554)	(41,479)	(42,536)
Change in contingent tax liabilities	(510)	(403)	(395)
Change in valuation allowance	2,055	243	3,702
Tax Cut and Jobs Act Impact	9,584	0	0
Other, net	(2,016)	(3,935)	(2,470)
Total provision for income taxes	$ 17,958	$ 7,904	$ 7,389

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