Income Taxes (Reconciliation of Statutory Rate to Effective Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Continuing operations:
Provisions using statutory federal income tax rate	$ 52,317	$ 49,410	$ 53,239
State income taxes (benefit), net of federal tax benefit	1,161	(322)	2,510
REIT Benefit	(41,479)	(42,536)	(44,538)
Change in contingent tax liabilities	(403)	(395)	(576)
Change in valuation allowance	243	3,702	664
Other, net	(3,935)	(2,470)	2,794
Total provision for income taxes	$ 7,904	$ 7,389	$ 14,093