Major Customer - NHC (Summary of NHC Percentage Rent) (Details) (National HealthCare Corporation [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Percentage rent	$ 2,296		$ 1,511		$ 1,082
Final determination based on prior year revenues [Member]
Percentage rent	635	[1]	485	[1]	541	[1]
Current year
Percentage rent	$ 1,661		$ 1,026		$ 541

[1] For purposes of the percentage rent calculation described in the master lease agreement, NHC's annual revenue by facility for a given year is certified to NHI by March 31st of the following year.