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Derivative Instruments and Hedging Activities (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) instrument | Dec. 31, 2017 USD ($) instrument | Dec. 31, 2016 USD ($) instrument | Oct. 31, 2016 USD ($)
Derivative [Line Items] |  |  |  |  |
Unsecured debt, net |  | $ 3,799,316,000 | $ 3,501,709,000 |  |
Total return swap income |  | 8,707,000 | 10,098,000 | $ 11,716,000 |
Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge ineffectiveness related to cash flow hedges |  | $ 100,000 | $ 100,000 | $ 300,000 |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments held | instrument |  | 5 | 1 | 4 |
Average fixed interest rate |  | 2.30% |  |  |
Derivative, fair value |  | $ 5,800,000 | $ 5,400,000 |  |
Aggregate carrying value of the interest rate swap contracts |  | 0 | 0 |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Total return swap income |  | 8,700,000 | $ 10,100,000 | $ 11,700,000 |
Not Designated as Hedging Instrument [Member] | Interest Rate Cap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments held | instrument |  |  | 3 |  |
Derivative, notional amount |  | 9,900,000 | $ 20,700,000 |  |
Derivative, fair value |  | 0 | 0 |  |
Not Designated as Hedging Instrument [Member] | Total Return Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, fair value |  | $ 0 | 0 |  |
Not Designated as Hedging Instrument [Member] | Total Return Swap [Callable] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of derivative instruments held | instrument |  | 4 |  |  |
Derivative, notional amount |  | $ 256,024,000 |  |  |
Variable rate term loan [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unsecured debt, net | $ 350,000,000 |  |  |  | $ 225,000,000
Debt instrument, term | 5 years |  |  |  |
Basis spread on rate |  | 0.95% |  |  |
Variable rate term loan [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unsecured debt, net |  | $ 350,000,000 | $ 350,000,000 |  |
Number of derivative instruments held | instrument |  | 5 |  |  |
Variable rate term loan [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount |  | $ 175,000,000 |  |  |
Variable rate mortgage notes payable [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Bond subject to interest rate caps |  | 256,000,000 |  |  |
Variable rate mortgage notes payable [Member] | Total Return Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Bond subject to interest rate caps |  | $ 9,900,000 |  |  |

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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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