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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes receivable | $ 10,992 |  | $ 10,481
Notes payable | 2,749,202 |  | 1,363,925
Unsecured credit facilities | 658,024 |  | 278,495
Provision for impairment | 0 | $ (866) |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities | 29,025 |  | 28,588
Available-for-sale Securities | 7,543 |  | 7,420
Interest Rate Derivative Assets, at Fair Value | 12,340 |  | 11,622
Total | 48,908 |  | 47,630
Derivative instruments, at fair value | (1,033) |  | (580)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities | 29,025 |  | 28,588
Available-for-sale Securities | 0 |  | 0
Interest Rate Derivative Assets, at Fair Value | 0 |  | 0
Total | 29,025 |  | 28,588
Derivative instruments, at fair value | 0 |  | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Payable, Fair Value | 2,832,355 |  | 1,435,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities | 0 |  | 0
Available-for-sale Securities | 7,543 |  | 7,420
Interest Rate Derivative Assets, at Fair Value | 12,340 |  | 11,622
Total | 19,883 |  | 19,042
Derivative instruments, at fair value | (1,033) |  | (580)
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Notes Receivable, Fair Value | 10,877 |  | 10,380
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities | 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 |  | $ 0
Unsecured Credit Facilities [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Risk Free Interest Rate | 1.70% |  | 1.50%
Unsecured Credit Facilities [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Risk Free Interest Rate | 1.70% |  | 1.60%
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 | $ 660,000 |  | $ 279,700
Notes Payable, Other Payables [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Risk Free Interest Rate | 3.00% |  | 2.90%
Notes Payable, Other Payables [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Risk Free Interest Rate | 3.80% |  | 3.90%
Notes Receivable [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Risk Free Interest Rate | 7.30% |  | 7.20%
Notes Receivable [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Risk Free Interest Rate | 7.30% |  | 7.20%

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