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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments | During the years ended December 31, 2018, 2017 and 2016, we entered into interest rate derivatives as summarized in the table below (in thousands):
| Year Ended December 31,
Interest rate caps | 2018 |  | 2017 |  | 2016
Notional amount (in thousands) | $ | 727,000 |  |  | $ | 844,200 |  |  | $ | 224,500 |
Strike rate low end of range | 2.43 | % |  | 3.00 | % |  | 5.43 | %
Strike rate high end of range | 7.80 | % |  | 11.61 | % |  | 5.78 | %
Effective date range | February 2018 - December 2018 |  |  | January 2017 - December 2017 |  |  | March 2016 - December 2016 |
Termination date range | March 2019 - June 2020 |  |  | March 2018 - September 2019 |  |  | March 2017 - December 2017 |
Total cost of interest rate caps (in thousands) | $ | 362 |  |  | $ | 375 |  |  | $ | 13 |
Interest rate floors |  |  |  |  |
Notional amount (in thousands) | $ | 4,000,000 |  |  | $ | 3,850,000 |  |  | $ | — |
Strike rate low end of range | 1.38 | % |  | 1.00 | % |  | — | %
Strike rate high end of range | 2.00 | % |  | 1.50 | % |  | — | %
Effective date | July 2018 |  |  | September 2017 - December 2017 |  |  | n/a |
Termination date range | June 2019 - September 2019 |  |  | March 2019 - June 2019 |  |  | n/a |
Total cost of interest rate floors (in thousands) | $ | 138 |  |  | $ | 140 |  |  | $ | — |
_______________ No instruments were designated as cash flow hedges Interest rate derivatives consisted of the following (in thousands):
Interest rate caps (1) | December 31, 2018 |  | December 31, 2017
Notional amount (in thousands) | $ | 1,292,500 |  |  | $ | 887,700 |
Strike rate minimum | 2.43 | % |  | 2.00 | %
Strike rate maximum | 11.61 | % |  | 11.61 | %
Effective date range | January 2017 - December 2018 |  |  | December 2015 - December 2017 |
Termination date range | January 2019 - June 2020 |  |  | January 2018 - September 2019 |
Aggregate principal balance on corresponding mortgage loans (in thousands) | $ | 805,500 |  |  | $ | 818,138 |
Interest rate floors (1) (2) |  |  |
Notional amount (in thousands) | $ | 10,850,000 |  |  | $ | 6,850,000 |
Strike rate low end of range | (0.25 | )% |  | (0.25 | )%
Strike rate high end of range | 2.00 | % |  | 1.50 | %
Effective date range | July 2015 - July 2018 |  |  | July 2015 - December 2017 |
Termination date range | March 2019 - July 2020 |  |  | March 2019 - July 2020 |
_______________
(1) | No instruments were designated as cash flow hedges
(2) | Cash collateral is posted by us as well as our counterparties. We offset the fair value of the derivative and the obligation/right to return/reclaim cash collateral.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959 + Details
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