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Debt And Interest Expense (Credit Facilities) (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Borrowing capacity of senior unsecured revolving credit facility		$ 200,000,000.0
Credit facility, maturity date	Apr. 01, 2020
Aggregate increase of commitment amount available		$ 150,000,000.0
Minimum [Member]
Debt Instrument [Line Items]
Interest coverage ratio		3.0
Maximum [Member]
Debt Instrument [Line Items]
Leverage ratio		2.5

X

- 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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Aggregate increase of commitment amount available.

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Balance Type:	credit
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- Definition

Interest Coverage Ratio

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Leverage Ratio

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