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Debt (Details Textuals) (USD $)
9 Months Ended
Sep. 30, 2014
Debt Instrument [Line Items]  
Line of Credit Facility, Remaining Borrowing Capacity $ 655,600,000
Debt Instrument, Face Amount 250,000,000
3.84% Senior Notes [Member]
 
Debt Instrument [Line Items]  
Debt Instrument, Face Amount 125,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.84%
Debt Instrument, Maturity Date Sep. 19, 2024
4.24% Senior Notes [Member]
 
Debt Instrument [Line Items]  
Debt Instrument, Face Amount $ 125,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.24%
Debt Instrument, Maturity Date Jun. 25, 2025