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Debt And Interest Expense (Credit Facilities) (Narrative) (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 27, 2015 | Apr. 30, 2013 | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Borrowing capacity of senior unsecured revolving credit facility |  |  |  | $ 200,000,000.0
Credit facility, maturity date | Apr. 01, 2020 | Apr. 01, 2025 | May 01, 2023 |
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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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