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Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notes receivable | $ 0 | $ 15,803
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 36,027 | 31,662
Available-for-sale Securities | 7,987 | 9,974
Interest Rate Derivative Assets, at Fair Value | 26,802 | 14,515
Total | 70,816 | 56,151
Derivative instruments, at fair value |  | (177)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 36,027 | 31,662
Available-for-sale Securities | 0 | 0
Interest Rate Derivative Assets, at Fair Value | 0 | 0
Total | 36,027 | 31,662
Derivative instruments, at fair value |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notes Payable, Fair Value | 2,952,604 | 3,058,044
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 0 | 0
Available-for-sale Securities | 7,987 | 9,974
Interest Rate Derivative Assets, at Fair Value | 26,802 | 14,515
Total | 34,789 | 24,489
Derivative instruments, at fair value |  | (177)
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notes Receivable, Fair Value | 0 | 15,660
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI | 0 | 0
Available-for-sale Securities | 0 | 0
Interest Rate Derivative Assets, at Fair Value | 0 | 0
Total | 0 | 0
Derivative instruments, at fair value |  | 0
Unsecured Credit Facilities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unsecured credit facilities, Fair Value | 710,000 | 625,000
Parent Company [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notes payable | 3,008,592 | 2,971,715
Unsecured credit facilities | $ 708,616 | $ 623,262

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