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Debt and Credit Agreements - 2013 Credit Agreement (Details) - Wells Fargo Bank, National Association - USD ($)
Jan. 06, 2016
Jan. 05, 2016
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