Summary Of Significant Accounting Policies Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact to accumulated dividends in excess of net income, net of tax	$ (6,028)
Net cash provided by operating activities	124,180	$ 123,933
Net cash used in investing activities	(46,178)	(279,276)
ASU 2016-18 | Before adoption of standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		121,100
Net cash used in investing activities		(278,300)
ASU 2016-18 | After adoption of standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		123,900
Net cash used in investing activities		$ (279,300)
Condominium sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact to accumulated dividends in excess of net income, net of tax	5,400
Cumulative impact to accumulated dividends in excess of net income, tax	1,400
Additional cumulative effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact to accumulated dividends in excess of net income, net of tax	$ 600