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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Schedule of financial assets and liabilities measured at fair value on recurring basis | The following tables present our financial assets and liabilities that we measured at fair value on a recurring basis by level within the fair value hierarchy as of June 30, 2019 and December 31, 2018:
| June 30, 2019
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Derivative assets | $ | 11,232 |  |  | $ | — |  |  | $ | 11,232 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Derivative liabilities | $ | 103,778 |  |  | $ | — |  |  | $ | 103,778 |  |  | $ | — |
| December 31, 2018
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |
Derivative assets | $ | 69,105 |  |  | $ | — |  |  | $ | 69,105 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Derivative liabilities | $ | 29,321 |  |  | $ | — |  |  | $ | 29,321 |  |  | $ | — |
Schedule of carrying amounts and fair values of most significant financial instruments | The carrying amounts and fair values of our most significant financial instruments as of June 30, 2019 and December 31, 2018 were as follows:
| June 30, 2019
| Carrying value |  | Fair value |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 782,884 |  |  | $ | 782,884 |  |  | $ | 782,884 |  |  | $ | — |  |  | $ | — |
Restricted cash | 187,401 |  |  | 187,401 |  |  | 187,401 |  |  | — |  |  | — |
Derivative assets | 11,232 |  |  | 11,232 |  |  | — |  |  | 11,232 |  |  | — |
| $ | 981,517 |  |  | $ | 981,517 |  |  | $ | 970,285 |  |  | $ | 11,232 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |
Debt | $ | 29,160,698 |  | (a) | $ | 29,440,673 |  |  | $ | — |  |  | $ | 29,440,673 |  |  | $ | — |
Derivative liabilities | 103,778 |  |  | 103,778 |  |  | — |  |  | 103,778 |  |  | — |
| $ | 29,264,476 |  |  | $ | 29,544,451 |  |  | $ | — |  |  | $ | 29,544,451 |  |  | $ | — |
(a) | Excludes debt issuance costs, debt discounts and debt premium.
| December 31, 2018
| Carrying value |  | Fair value |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,204,018 |  |  | $ | 1,204,018 |  |  | $ | 1,204,018 |  |  | $ | — |  |  | $ | — |
Restricted cash | 211,017 |  |  | 211,017 |  |  | 211,017 |  |  | — |  |  | — |
Derivative assets | 69,105 |  |  | 69,105 |  |  | — |  |  | 69,105 |  |  | — |
| $ | 1,484,140 |  |  | $ | 1,484,140 |  |  | $ | 1,415,035 |  |  | $ | 69,105 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |
Debt | $ | 29,668,203 |  | (a) | $ | 29,031,153 |  |  | $ | — |  |  | $ | 29,031,153 |  |  | $ | — |
Derivative liabilities | 29,321 |  |  | 29,321 |  |  | — |  |  | 29,321 |  |  | — |
| $ | 29,697,524 |  |  | $ | 29,060,474 |  |  | $ | — |  |  | $ | 29,060,474 |  |  | $ | — |
(a) Excludes debt issuance costs, debt discounts and debt premium.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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