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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Summary of balance sheet fair values | All financial instruments of the Company are reflected in the accompanying Consolidated Balance Sheets at amounts which, in management's estimation, reasonably approximate their fair values, except for the following:
| June 30, 2017 |  | December 31, 2016
(in thousands) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Financial assets: |  |  |  |  |  |  |
Notes receivable | $ | 13,332 |  |  | 13,223 |  |  | $ | 10,481 |  |  | 10,380 |
Financial liabilities: |  |  |  |  |  |  |
Notes payable | $ | 2,944,995 |  |  | $ | 2,988,426 |  |  | $ | 1,363,925 |  |  | 1,435,000 |
Unsecured credit facilities | $ | 563,031 |  |  | $ | 565,000 |  |  | $ | 278,495 |  |  | 279,700 |
Fair Value, Interest rate ranges [Table Text Block] | The following interest rate ranges were used by the Company to estimate the fair value of its financial instruments:
|  | June 30, 2017 |  | December 31, 2016
|  | Low |  | High |  | Low |  | High
Notes receivable |  | 7.3% |  | 7.3% |  | 7.2% |  | 7.2%
Notes payable |  | 3.1% |  | 4.1% |  | 2.9% |  | 3.9%
Unsecured credit facilities |  | 2.0% |  | 2.0% |  | 1.5% |  | 1.6%
Summary of assets measured on recurring basis | The following tables present the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis:
| Fair Value Measurements as of June 30, 2017
(in thousands) |  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Assets: | Balance |  | (Level 1) |  | (Level 2) |  | (Level 3)
Trading securities held in trust | $ | 29,839 |  |  | 29,839 |  |  | — |  |  | — |
Available-for-sale securities | 7,009 |  |  | — |  |  | 7,009 |  |  | — |
Interest rate derivatives | 10,499 |  |  | — |  |  | 10,499 |  |  | — |
Total | $ | 47,347 |  |  | 29,839 |  |  | 17,508 |  |  | — |
Liabilities: |  |  |  |  |  |  |
Interest rate derivatives | $ | (1,664 | ) |  | — |  |  | (1,664 | ) |  | — |
| Fair Value Measurements as of December 31, 2016
(in thousands) |  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Assets: | Balance |  | (Level 1) |  | (Level 2) |  | (Level 3)
Trading securities held in trust | $ | 28,588 |  |  | 28,588 |  |  | — |  |  | — |
Available-for-sale securities | 7,420 |  |  | — |  |  | 7,420 |  |  | — |
Interest rate derivatives | 11,622 |  |  | — |  |  | 11,622 |  |  | — |
Total | $ | 47,630 |  |  | 28,588 |  |  | 19,042 |  |  | — |
Liabilities: |  |  |  |  |  |  |
Interest rate derivatives | $ | (580 | ) |  | — |  |  | (580 | ) |  | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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