Schedule III Real Estate Investments and Accumulated Depreciation (Summary Of Activity For Real Estate)(Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule III Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of year	$ 651,839	$ 445,348
Acquisition of properties	236,747	212,434
Disposition of properties		(16,500)
Properties held for sale	(6,962)
Improvements, net of write-offs	19,649	10,557
Balance at end of year	$ 901,273	$ 651,839