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Fair Value Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Asset Impairment Charges $ 0 $ 10,200 $ 0 $ 10,195 $ 0  
Mortgage notes and related accrued interest receivable 972,371     972,371   $ 613,978
Investment in a direct financing lease, net 57,698     $ 57,698   $ 102,698
Finance lease investment weighted average interest rate       11.98%   12.00%
Minimum interest on investments in direct finance lease       11.90% 11.79%  
Maximum interest on investments in direct finance lease       12.38% 12.38%  
Debt 2,987,925     $ 2,987,925   $ 2,485,625
Fixed Rate Mortgage Notes Receivable [Member]            
Mortgage notes and related accrued interest receivable 972,400     $ 972,400   $ 614,000
Weighted average interest rate of mortgage notes receivable       8.40%   8.77%
Receivable interest rate minimum       7.00%   7.00%
Receivable interest rate maximum       11.31%   11.31%
Weighted market rate used for determining future cash flow for notes receivable       8.53%   8.48%
Fair value of notes receivable 1,000,000     $ 1,000,000   $ 648,500
Variable Rate Debt [Member]            
Debt $ 595,000     $ 595,000   $ 375,000
Long-term debt, weighted average interest rate 2.42%     2.42%   3.23%
Variable Rate Converted to Fixed Rate [Member]            
Debt $ 300,000     $ 300,000   $ 300,000
Fixed Rate Debt [Member]            
Debt $ 2,430,000     $ 2,430,000   $ 2,140,000
Long-term debt, weighted average interest rate 5.15%     5.15%   5.27%
Weighted market rate for determining fair value of debt       3.96%   4.26%
Fair value of debt $ 2,540,000     $ 2,540,000    
Long-term Debt, Fair Value           $ 2,210,000
Minimum [Member] | Fixed Rate Mortgage Notes Receivable [Member]            
market rate used as discount factor to determine fair value of notes       7.00%   7.00%
Minimum [Member] | Fixed Rate Debt [Member]            
market rate used as discount factor to determine fair value of debt       2.89%   2.97%
Maximum [Member] | Fixed Rate Mortgage Notes Receivable [Member]            
market rate used as discount factor to determine fair value of notes       12.00%   12.00%
Maximum [Member] | Fixed Rate Debt [Member]            
market rate used as discount factor to determine fair value of debt       4.56%   4.75%
Imagine Schools Member            
Investment in a direct financing lease, net $ 100,000     $ 100,000