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Lines Of Credit (Details) (Line of Credit [Member]) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 2012 Credit Facility [Member] USD ($) | Dec. 31, 2013 2012 Credit Facility [Member] London Interbank Offered Rate (LIBOR) [Member] | Dec. 31, 2013 Canadian Subsidiary Credit Facility [Member] CAD
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |
Credit facility |  |  |  | $ 300,000 |  | 2,000
Credit facility, expiration date |  |  |  | Feb. 02, 2017 |  |
Credit facility interest accrued, percentage above LIBOR |  |  |  |  | 1.25% |
Credit facility, commitment fee per annum on daily unused portion, percent |  |  |  | 0.15% |  |
Aggregate amount that may increase under credit facility |  |  |  | 100,000 |  |
Interest Expense and Commitment Fees | $ 458 | $ 585 | $ 1,478 |  |  |

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- Definition Line of Credit Facility, Conditional Increase (Decrease), Net + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Date the credit facility terminates, 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- 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://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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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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 No definition available. + Details
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