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Summary of Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Maximum maturity term of financial assets 90 days 90 days  
Notes receivable $ 3,695 $ 3,695 $ 3,553
Carrying value of total indebtedness of continuing operations $ 3,700,000 $ 3,700,000 $ 2,000,000
Minimum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notes receivable fair value variance from carrying value (as a percent) (11.60%) (11.60%) (14.20%)
Total indebtedness fair value variance from carrying value (as a percent) 96.10% 96.10% 97.50%
Maximum [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Notes receivable fair value variance from carrying value (as a percent) (2.30%) (2.30%) (5.20%)
Total indebtedness fair value variance from carrying value (as a percent) 106.20% 106.20% 107.80%