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Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  | 3 Months Ended | 0 Months Ended | 3 Months Ended |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 Private Placement, Notes [Member] | Mar. 24, 2014 Credit Agreement [Member] | Mar. 31, 2014 Credit Agreement [Member] | Jan. 16, 2014 Credit Agreement [Member] | Mar. 31, 2014 Credit Agreement [Member] Minimum [Member] | Mar. 31, 2014 Credit Agreement [Member] Maximum [Member] | May 20, 2013 Credit Agreement [Member] Interest Rate Swap [Member] | Jul. 16, 2010 Credit Agreement [Member] Interest Rate Swap [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  | $ 150 |  |  |  |  |  |  |
Interest rate |  | 6.84% |  |  |  |  |  |  |
Maturity date |  | Oct. 25, 2017 |  |  |  |  |  |  |
Year of maturity |  |  |  | 2018 |  |  |  |  |
Payment required on October 25, 2015 |  | 50 |  |  |  |  |  |  |
Fair value of long-term debt |  | 114.6 |  |  |  |  |  |  |
Amount of credit facility |  |  |  | 330 |  |  |  |  |
Amount of credit facility outstanding |  |  |  | 199 |  |  |  |  |
Additional amount that can be borrowed on facility |  |  |  | 131 |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 110 | $ 105
Fixed interest rate in swap |  |  |  |  |  |  |  | 1.414% | 2.04%
LIBOR spread |  |  | 1.375% |  |  | 1.25% | 1.875% |  |
Effective annual rate |  |  |  | 3.415% |  |  |  |  |
Maximum leverage ratio allowed | 3.50 |  |  |  |  |  |  |  |
Minimum interest coverage ratio required | 3.00 |  |  |  |  |  |  |  |
Leverage ratio | 1.75 |  |  |  |  |  |  |  |
Interest coverage ratio | 9.68 |  |  |  |  |  |  |  |
LIBOR rate |  |  |  | 0.152% | 0.24% |  |  |  |

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- Definition Covenant, Maximum Leverage Ratio. + References No definition available. + Details
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- Definition Covenant, Minimum Interest Coverage Ratio. + References No definition available. + Details
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- Definition Debt Instrument, Date Of Maturity. + References No definition available. + Details
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- Definition Debt Instrument Payment Required On Tenth Anniversary. + References No definition available. + Details
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Balance Type: | debit
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate. + References No definition available. + Details
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- Definition Interest Coverage Ratio. + References No definition available. + Details
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- Definition Leverage Ratio. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + 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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: 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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Balance Type: | credit
Period Type: | instant

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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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Balance Type: | credit
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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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Balance Type: | credit
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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