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Interest Rate Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income |  |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivatives | $ 1,325 | $ (301) | $ 7,913 | $ (1,877) |
Interest rate swaps | Interest Expense |  |  |  |  |
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income |  |  |  |  |
Amount of Gain (Loss) Reclassified from AOCI into Interest Expense on Statement of Operations | 207 | $ (615) | 9 | $ (2,740) |
Interest rate swaps | Interest rate derivatives |  |  |  |  |
Fair value of interest rate derivatives and balance sheet classification |  |  |  |  |
Interest rate swaps designated as cash flow hedges | 10,875 |  | 10,875 |  | $ 3,073
Designated |  |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |  |
Fair value of interest rate swaps | 10,875 |  | 10,875 |  | 3,073
Designated | Interest rate swaps |  |  |  |  |
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income |  |  |  |  |
Approximate loss amount to be reclassified from AOCI to interest expense over the next 12 months | (2,500) |  | (2,500) |  |
Designated | Interest rate swap, effective date September 1, 2015, swap two |  |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |  |
Notional Amount | $ 100,000 |  | $ 100,000 |  |
Fixed rate (as a percent) | 1.73% |  | 1.73% |  |
Fair value of interest rate swaps | $ 695 |  | $ 695 |  | 252
Designated | Interest rate swap, effective October 13, 2015 |  |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |  |
Notional Amount | $ 12,931 |  | $ 12,931 |  |
Fixed rate (as a percent) | 1.39% |  | 1.39% |  |
Fair value of interest rate swaps | $ 349 |  | $ 349 |  | 213
Notional amount of interest rate derivatives after scheduled amortization | 12,100 |  | 12,100 |  |
Designated | Interest rate swap, effective September 1, 2016, swap one |  |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |  |
Notional Amount | $ 100,000 |  | $ 100,000 |  |
Fixed rate (as a percent) | 1.9013% |  | 1.9013% |  |
Fair value of interest rate swaps | $ 3,937 |  | $ 3,937 |  | 1,046
Designated | Interest rate swap, effective September 1, 2016, swap two |  |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |  |
Notional Amount | $ 100,000 |  | $ 100,000 |  |
Fixed rate (as a percent) | 1.905% |  | 1.905% |  |
Fair value of interest rate swaps | $ 3,943 |  | $ 3,943 |  | 1,051
Designated | Interest rate swap, effective September 1, 2016, swap three |  |  |  |  |
Fair values of interest rate swap derivatives |  |  |  |  |
Notional Amount | $ 50,000 |  | $ 50,000 |  |
Fixed rate (as a percent) | 1.9079% |  | 1.9079% |  |
Fair value of interest rate swaps | $ 1,951 |  | $ 1,951 |  | $ 511

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Represents the notional amount of interest rate derivatives after scheduled amortization. + References No definition available. + Details
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