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Credit Facilities - Prior Credit Facility - Terms (Details) - JPMorgan Chase Bank, N.A. - Revolving Credit Facility	12 Months Ended
	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity (up to)	$ 740,000,000
Commitment fee percentage	50.00%
Above Threshold
Line of Credit Facility [Line Items]
Unused capacity commitment fee	0.25%
Below Threshold
Line of Credit Facility [Line Items]
Unused capacity commitment fee	0.15%
LIBOR | Line of Credit Facility, Base Rate, Option Three
Line of Credit Facility [Line Items]
Interest rate spread	1.00%
Federal Funds | Line of Credit Facility, Base Rate, Option Two
Line of Credit Facility [Line Items]
Interest rate spread	0.50%
Minimum | Base Rate | Line of Credit Facility, Interest Rate, Option Two
Line of Credit Facility [Line Items]
Interest rate spread	0.60%
Minimum | LIBOR | Line of Credit Facility, Interest Rate, Option One
Line of Credit Facility [Line Items]
Interest rate spread	1.60%
Maximum | Base Rate | Line of Credit Facility, Interest Rate, Option Two
Line of Credit Facility [Line Items]
Interest rate spread	1.20%
Maximum | LIBOR | Line of Credit Facility, Interest Rate, Option One
Line of Credit Facility [Line Items]
Interest rate spread	2.20%

X

- Definition

Line of Credit Facility, Commitment Fee Percentage, Threshold, Unused Capacity as a Percentage of Current Capacity

+ References

No definition available.

+ Details

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- Definition

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+ References

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- Definition

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+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

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