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Fair Value Disclosures (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mortgage notes and related accrued interest receivable $ 641,428 $ 970,749
Investment in a direct financing lease, net $ 58,305 $ 57,903
Finance lease investment weighted average interest rate 11.98% 11.98%
Minimum interest on investments in direct finance lease 11.90% 11.90%
Maximum interest on investments in direct finance lease 12.38% 12.38%
Debt $ 2,983,975 $ 3,028,827
Fixed Rate Mortgage Notes Receivable [Member]    
Mortgage notes and related accrued interest receivable $ 641,400 $ 970,700
Weighted average interest rate of mortgage notes receivable 8.67% 8.42%
Receivable interest rate minimum 7.00% 7.00%
Receivable interest rate maximum 11.43% 11.31%
Weighted market rate used for determining future cash flow for notes receivable 9.37% 8.79%
Fair value of notes receivable $ 666,100 $ 992,600
Variable Rate Debt [Member]    
Debt $ 455,000 $ 635,000
Long-term debt, weighted average interest rate 2.71% 2.58%
Variable Rate Converted to Fixed Rate [Member]    
Debt $ 350,000 $ 350,000
Fixed Rate Debt [Member]    
Debt $ 2,570,000 $ 2,430,000
Long-term debt, weighted average interest rate 4.86% 5.15%
Weighted market rate for determining fair value of debt 4.85% 4.04%
Fair value of debt $ 2,550,000  
Long-term Debt, Fair Value   $ 2,530,000
Minimum [Member] | Fixed Rate Mortgage Notes Receivable [Member]    
market rate used as discount factor to determine fair value of notes 7.50% 7.00%
Minimum [Member] | Fixed Rate Debt [Member]    
market rate used as discount factor to determine fair value of debt 3.11% 2.49%
Maximum [Member] | Fixed Rate Mortgage Notes Receivable [Member]    
market rate used as discount factor to determine fair value of notes 11.50% 11.50%
Maximum [Member] | Fixed Rate Debt [Member]    
market rate used as discount factor to determine fair value of debt 5.26% 4.56%
Imagine Schools Member    
Investment in a direct financing lease, net $ 58,300 $ 57,900