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Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Income Tax Expense (Benefit) $ 6,758,000 $ 7,700,000 $ 14,757,000 $ 16,398,000  
Number of Reportable Segments     2    
Number of Operating Segments     2    
Continuing Care Retirement Communities Advance Fees, Obligation for Future Services, Amount $ 3,236,000   $ 3,236,000   $ 3,236,000
Malpractice Loss Contingency, Number of Claims 61   61    
Appreciation [Member]          
Malpractice Loss Contingency, Number of Claims 61   61    
Appreciation of Apartment Over Original Residents Entry Fee Percentage     40.00%    
Refundable Advance Fees [Member]          
Customer Refundable Fees $ 9,167,000   $ 9,167,000   9,924,000
Nonrefundable Resident Entry Fee Percentage     10.00%    
Original Entry Fee [Member]          
Refundable Resident Entry Fee Percentage     90.00%    
Corporate Office Costs [Member]          
General and Administrative Expense     $ 15,262,000 $ 14,364,000  
Minimum [Member]          
Management Services Fees     6.00%    
Minimum [Member] | Building and Building Improvements [Member]          
Property, Plant and Equipment, Useful Life     20 years    
Minimum [Member] | Equipment and Furniture [Member]          
Property, Plant and Equipment, Useful Life     3 years    
Maximum [Member]          
Management Services Fees     7.00%    
Maximum [Member] | Building and Building Improvements [Member]          
Property, Plant and Equipment, Useful Life     40 years    
Maximum [Member] | Equipment and Furniture [Member]          
Property, Plant and Equipment, Useful Life     15 years    
Medicare and Medicaid [Member]          
Allowance for Doubtful Accounts Receivable 17,950,000   $ 17,950,000   $ 17,019,000
Percent of Revenues Derived from Medicare, Medicaid and Other Government Programs [Member]          
Concentration Risk, Percentage     65.00%    
Accounting Standards Update 2016-09 [Member]          
Income Tax Expense (Benefit) $ (123,000)   $ (244,000)