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Derivative and Hedging Activities Derivative and Hedging Activities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Feb. 09, 2018 USD ($) | Dec. 31, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Interest Rate Derivative Assets, at Fair Value | $ 10,500 |  | $ 10,500 |  |  | $ 2,200
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | 700 |  | 700 |  |  |
Unrealized Gain on cash flow hedging activities | 5,181 | $ 0 | 8,782 | $ 0 |  |
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion | 5,200 |  | 8,800 |  |  |
Interest Rate Derivative Liabilities, at Fair Value | 0 |  | 0 |  |  | 500
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  | $ 175,000 |  | $ 175,000 |  |
Interest Rate Swap [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Interest Rate Derivative Assets, at Fair Value | 10,500 |  | 10,500 |  |  | 2,200
Interest Rate Derivative Liabilities, at Fair Value | 0 |  | 0 |  |  | $ 500
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 400,000 |  | $ 400,000 |  | $ 200,000 |
Number of Interest Rate Derivatives Held | 5 |  | 5 |  | 2 |

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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 The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: 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=77997519&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: 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=77997519&loc=d3e13433-108611 + Details
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