Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of derivative instruments of a particular group held by the entity.

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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.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Derivative, Number of Derivative Instruments Associated With Loans

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Derivatives and Hedging Activities - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) derivative	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) derivative	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) derivative
Derivative [Line Items]
Derivative assets	$ 351		$ 351		$ 199
Loans Payable [Member] \| Credit Facility [Member]
Derivative [Line Items]
Reclassified from AOCI into interest expense			1,100
Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	$ 27,800		$ 27,800
Number of instruments held \| derivative	1		1
Interest Rate Swap [Member]
Derivative [Line Items]
Amount of gain (loss) related to change in fair value and other ineffectiveness	$ 21	$ 300	$ 17	$ (1,100)
Derivative assets	300		300
Aggregate termination value had provisions been breached	$ 300		$ 300
Interest Rate Swap [Member] \| Loans Payable [Member] \| Credit Facility [Member]
Derivative [Line Items]
Number of interest rate swaps \| derivative	6		6
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Gain (Loss) in earnings related to ineffective portion	$ 200	$ 1,000	$ 1,600	$ 1,100
Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Interest Expense [Member]
Derivative [Line Items]
Reclassified from AOCI into interest expense	100		(200)
Reclassified from AOCI interest expense in relation to previously settled interest rate derivatives	200		600
Derivative loss to be reclassified during next 12 months	$ 400		$ 400
Interest Rate Swap [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Number of interest rate swaps \| derivative	0		0		14
Number of derivative instruments associated with loans \| derivative	6		13
Notional amount	$ 0		$ 0		$ 690,816
Six Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	550,900		550,900
Thirteen Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Derivative [Line Items]
Notional amount	$ 662,400		$ 662,400