Fair Value Measurements and Derivative Instruments (Schedule of Interest Rate Swaps and Caps) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Wells Fargo [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Effective date	Nov. 01, 2017
Maturity date	Nov. 30, 2022
Notional amount	$ 26,257	$ 26,465
KeyBank Credit Facility [Member] \| Interest Rate Cap [Member]
Derivative [Line Items]
Effective date	Mar. 01, 2017
Maturity date	Mar. 31, 2019
Notional amount	$ 50,000	$ 50,000
LIBOR [Member] \| Wells Fargo [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
Basis spread	2.39%
LIBOR [Member] \| Wells Fargo [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
LIBOR [Member] \| KeyBank Credit Facility [Member] \| Interest Rate Cap [Member]
Derivative [Line Items]
Reference rate	30-day LIBOR
Basis spread	2.50%
Federal Funds Effective Swap Rate [Member] \| Wells Fargo [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Basis spread	2.053%

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

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

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

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- Details

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