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Debt and Credit Agreements (Details 3) (Revolving Credit Facility, USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 Q | Dec. 31, 2012 | Dec. 31, 2011
Debt |  |  |
Number of trailing quarters used to calculate annual coverage ratio | 4 |  |
Availability under the credit facility | $ 939.0 |  |
Weighted-average effective interest rates (as a percent) | 2.30% | 3.00% | 4.10%
Weighted-average interest rate (as a percent) | 2.00% | 2.20% |
Greater than |  |  |
Debt |  |  |
Commitment fee percentage | 0.375% |  |
Current ratio | 1.0 |  |
Asset coverage ratio | 1.75 |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the first level | 25.00% |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the second level | 50.00% |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the third level | 75.00% |  |
Percentage of the entity's total indebtedness to its borrowing base under the credit facility under the fourth level | 90.00% |  |
Less than or equal to |  |  |
Debt |  |  |
Commitment fee percentage | 0.50% |  |
Eurodollar Loans |  |  |
Debt |  |  |
Description of variable rate basis | Euro-Dollars (LIBOR) |  |
ABR Loans |  |  |
Debt |  |  |
Description of variable rate basis | Base Rate (Prime) |  |
Less than 25 percent | Eurodollar Loans |  |  |
Debt |  |  |
Margin (as a percent) | 1.50% |  |
Less than 25 percent | ABR Loans |  |  |
Debt |  |  |
Margin (as a percent) | 0.50% |  |
Greater than equal to 25 percent but less than 50 percent | Eurodollar Loans |  |  |
Debt |  |  |
Margin (as a percent) | 1.75% |  |
Greater than equal to 25 percent but less than 50 percent | ABR Loans |  |  |
Debt |  |  |
Margin (as a percent) | 0.75% |  |
Greater than equal to 50 percent but less than 75 percent | Eurodollar Loans |  |  |
Debt |  |  |
Margin (as a percent) | 2.00% |  |
Greater than equal to 50 percent but less than 75 percent | ABR Loans |  |  |
Debt |  |  |
Margin (as a percent) | 1.00% |  |
Greater than equal to 75 percent but less than 90 percent | Eurodollar Loans |  |  |
Debt |  |  |
Margin (as a percent) | 2.25% |  |
Greater than equal to 75 percent but less than 90 percent | ABR Loans |  |  |
Debt |  |  |
Margin (as a percent) | 1.25% |  |
Greater than and equal to 90 percent | Eurodollar Loans |  |  |
Debt |  |  |
Margin (as a percent) | 2.50% |  |
Greater than and equal to 90 percent | ABR Loans |  |  |
Debt |  |  |
Margin (as a percent) | 1.50% |  |

X
- Definition Represents the required asset coverage ratio under the terms of the agreement. + References No definition available. + Details
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- Definition Represents the ratio of current assets to current liabilities. + References No definition available. + Details
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X
- Definition Represents the number of trailing quarters used to calculate the annual coverage ratio. + References No definition available. + Details
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X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the fourth level. + References No definition available. + Details
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X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the first level. + References No definition available. + Details
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X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the third level. + References No definition available. + Details
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X
- Definition Represents the percentage of the entity's total indebtedness to its borrowing base under the credit facility under the second level. + References No definition available. + Details
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X
- 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 The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Details
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- Definition The effective interest rate during the reporting period. + 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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X
- 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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- Definition Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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