Subsequent Events - (Details) - Subsequent Event $ in Millions	Mar. 14, 2019 USD ($)
Bank Of America \| Revolving Facility \| Line of Credit
Subsequent Event [Line Items]
Credit Facility, Term	5 years
Line of Credit Facility, Increase (Decrease), Net	$ 60.0
Line of Credit Facility, Maximum Borrowing Capacity	5.0
Long-term Line of Credit	30.0
Debt Outstanding, Prepayment	30.0
Bank Of America \| Swingline \| Line of Credit
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 5.0
Debt Instrument Secured, Equity Interest, Percentage	65.00%
Minimum \| Senior Notes
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.50%
LIBOR \| Maximum \| Senior Notes
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
LIBOR \| Maximum \| Bank Of America \| Senior Notes
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.89%
Base Rate \| Minimum \| Senior Notes
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.50%
Base Rate \| Maximum \| Senior Notes
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.25%

Credit facility, term

No definition available.

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- Definition

Debt Instrument Secured, Equity Interest, Percentage

+ References

No definition available.

+ Details

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- Definition

Debt Outstanding, Prepayment

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

+ Details

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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