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Fair Value Measurements (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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes receivable | $ 13,332 |  | $ 13,332 |  | $ 10,481
Notes payable | 2,944,995 |  | 2,944,995 |  | 1,363,925
Unsecured credit facilities | 563,031 |  | 563,031 |  | 278,495
Provision for impairment | 0 | $ 0 | 0 | $ (1,666) |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Trading Securities | 29,839 |  | 29,839 |  | 28,588
Available-for-sale Securities | 7,009 |  | 7,009 |  | 7,420
Interest Rate Derivative Assets, at Fair Value | 10,499 |  | 10,499 |  | 11,622
Total | 47,347 |  | 47,347 |  | 47,630
Derivative instruments, at fair value | (1,664) |  | (1,664) |  | (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 | 29,839 |  | 29,839 |  | 28,588
Available-for-sale Securities | 0 |  | 0 |  | 0
Interest Rate Derivative Assets, at Fair Value | 0 |  | 0 |  | 0
Total | 29,839 |  | 29,839 |  | 28,588
Derivative instruments, at fair value | 0 |  | 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 | 2,988,426 |  | 2,988,426 |  | 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 |  | 0
Available-for-sale Securities | 7,009 |  | 7,009 |  | 7,420
Interest Rate Derivative Assets, at Fair Value | 10,499 |  | 10,499 |  | 11,622
Total | 17,508 |  | 17,508 |  | 19,042
Derivative instruments, at fair value | (1,664) |  | (1,664) |  | (580)
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes Receivable, Fair Value | 13,223 |  | 13,223 |  | 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 |  | 0
Available-for-sale Securities | 0 |  | 0 |  | 0
Interest Rate Derivative Assets, at Fair Value | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Derivative instruments, at fair value | 0 |  | $ 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 |  |  | 2.00% |  | 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 |  |  | 2.00% |  | 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 | $ 565,000 |  | $ 565,000 |  | $ 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 |  |  | 3.10% |  | 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 |  |  | 4.10% |  | 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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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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