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Debt and Credit Agreements - 2013 Credit Agreement (Details) - Wells Fargo Bank, National Association - USD ($) | Jan. 06, 2016 | Jan. 05, 2016
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Letter of Credit |  |
Debt Instrument [Line Items] |  |
Revolving credit facility with a letter of credit sub limit |  | $ 10,000,000
Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Revolving credit facility with a letter of credit sub limit | $ 315,000,000 | $ 200,000,000

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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 + Details
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