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Fair Value Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Asset Impairment Charges $ 10,195 $ 0 $ 10,195 $ 0  
Mortgage notes and related accrued interest receivable 941,599   941,599   $ 613,978
Investment in a direct financing lease, net 93,307   $ 93,307   $ 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% 11.79%
Maximum interest on investments in direct finance lease     12.38% 12.38% 12.38%
Debt 2,792,920   $ 2,792,920   $ 2,485,625
Fixed Rate Mortgage Notes Receivable [Member]          
Mortgage notes and related accrued interest receivable 941,600   $ 941,600   $ 614,000
Weighted average interest rate of mortgage notes receivable     8.45%   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 972,800   $ 972,800   $ 648,500
Variable Rate Debt [Member]          
Debt $ 375,000   $ 375,000   $ 375,000
Long-term debt, weighted average interest rate 3.28%   3.28%   3.23%
Variable Rate Converted to Fixed Rate [Member]          
Debt $ 300,000   $ 300,000   $ 300,000
Fixed Rate Debt [Member]          
Debt $ 2,450,000   $ 2,450,000   $ 2,140,000
Long-term debt, weighted average interest rate 5.16%   5.16%   5.27%
Weighted market rate for determining fair value of debt     4.03%   4.26%
Fair value of debt $ 2,560,000   $ 2,560,000    
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     3.06%   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 $ 57,500   $ 57,500