Derivative Instruments - Estimated Fair Values of Derivative Instruments (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Interest rate cap agreement
Derivative Instruments, Gain (Loss)
Contract/Notional Amount	$ 249,000,000	$ 249,000,000
Carrying Amount	$ 0	$ 0
LIBOR \| Maximum
Derivative Instruments, Gain (Loss)
Derivative, basis spread on variable rate (maximum)	4.00%	4.00%
Fair Value, Measurements, Recurring \| Level 2
Derivative Instruments, Gain (Loss)
Fair Value	$ 0	$ 0
Fair Value, Measurements, Recurring \| Level 2 \| Interest rate cap agreement
Derivative Instruments, Gain (Loss)
Fair Value	$ 0	$ 0

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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Period Type:	instant

- Definition

Derivative carrying amount.

+ References

No definition available.

+ Details

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ 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

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

No definition available.

+ Details

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- Details

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- Details

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- Details

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