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Derivative Instruments and Hedging Activities (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Fair Value of Derivative Instruments Not Designated | The following table presents the fair value of derivative instruments and their location in our condensed consolidated balance sheets at March 31, 2019 and December 31, 2018, respectively (dollar amounts in thousands):
Type of Derivative Instrument |  | Balance Sheet Location |  | March 31, 2019 |  | December 31, 2018
Interest rate swaps (1) |  | Derivative assets |  | $ | 14,873 |  |  | $ | 10,263 |
(1) | All of the Company's interest rate swaps outstanding are cleared through a central clearing house. The Company exchanges variation margin for swaps based upon daily changes in fair value. As a result of amendments to rules governing certain central clearing activities, the exchange of variation margin is treated as a legal settlement of the exposure under the swap contract. Previously such payments were treated as cash collateral pledged against the exposure under the swap contract. Accordingly, the Company accounted for the receipt or payment of variation margin as a direct reduction to or increase of the carrying value of the interest rate swap asset or liability on the Company's condensed consolidated balance sheets. Includes $12.8 million of derivative liabilities netted against a variation margin of $27.7 million at March 31, 2019. Includes $1.8 million of derivative assets and variation margin of $8.5 million at December 31, 2018.
Schedule Of Derivative Instruments Volume Activity | The tables below summarize the activity of derivative instruments not designated as hedges for the three months ended March 31, 2019 and 2018, respectively (dollar amounts in thousands):
|  | Notional Amount For the Three Months Ended March 31, 2019
Type of Derivative Instrument |  | December 31, 2018 |  | Additions |  | Settlement, Expiration or Exercise |  | March 31, 2019
Interest rate swaps |  | $ | 495,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 495,500 |
|  | Notional Amount For the Three Months Ended March 31, 2018
Type of Derivative Instrument |  | December 31, 2017 |  | Additions |  | Settlement, Expiration or Exercise |  | March 31, 2018
Interest rate swaps |  | $ | 345,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 345,500 |
Schedule of Components of Realized and Unrealized Gains and Losses | The following table presents the components of realized and unrealized gains and losses related to our derivative instruments that were not designated as hedging instruments included in other income category in our condensed consolidated statements of operations for the three months ended March 31, 2019 and 2018 (dollar amounts in thousands):
| Three Months Ended March 31,
| 2019 |  | 2018
| Realized Gains (Losses) |  | Unrealized Gains (Losses) |  | Realized Gains (Losses) |  | Unrealized Gains (Losses)
Interest rate swaps | $ | — |  |  | $ | (14,586 | ) |  | $ | — |  |  | $ | 8,969 |
Total | $ | — |  |  | $ | (14,586 | ) |  | $ | — |  |  | $ | 8,969 |
Schedule of Interest Rate Swaps, Variable and Fixed Interest Rates | The following table presents information about our interest rate swaps whereby we receive floating rate payments in exchange for fixed rate payments as of March 31, 2019 and December 31, 2018, respectively (dollar amounts in thousands):
|  | March 31, 2019 |  | December 31, 2018
Swap Maturities |  | Notional Amount |  | Weighted Average Fixed Interest Rate |  | Weighted Average Variable Interest Rate |  | Notional Amount |  | Weighted Average Fixed Interest Rate |  | Weighted Average Variable Interest Rate
2024 |  | $ | 98,000 |  |  | 2.18 | % |  | 2.78 | % |  | $ | 98,000 |  |  | 2.18 | % |  | 2.45 | %
2027 |  | 247,500 |  |  | 2.39 | % |  | 2.74 | % |  | 247,500 |  |  | 2.39 | % |  | 2.53 | %
2028 |  | 150,000 |  |  | 3.23 | % |  | 2.74 | % |  | 150,000 |  |  | 3.23 | % |  | 2.53 | %
Total |  | $ | 495,500 |  |  | 2.60 | % |  | 2.75 | % |  | $ | 495,500 |  |  | 2.60 | % |  | 2.52 | %

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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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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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