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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

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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 + Details
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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 + Details
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