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Debt (Credit Facility) (Details) (USD $)
0 Months Ended
Aug. 01, 2013
Line of Credit Facility [Line Items]  
Credit facility borrowing capacity $ 310,000,000
Term loan amount 50,000,000
Debt term 5 years
Lender fees, closing and transaction costs 1,700,000
Basis spread on borrowings variable rate 195.00%
Weighted-average interest rate 2.20%
Additional borrowing capacity under accordion feature 500,000,000
Term loan, amount outstanding 50,000,000
Remaining borrowing capacity 117,300,000
Revolving Credit Facility [Member]
 
Line of Credit Facility [Line Items]  
Credit facility borrowing capacity 260,000,000
Debt term 3 years
Revolving credit facility, amount outstanding $ 122,500,000
Minimum [Member]
 
Line of Credit Facility [Line Items]  
Basis spread on borrowings variable rate 165.00%
Maximum [Member]
 
Line of Credit Facility [Line Items]  
Basis spread on borrowings variable rate 225.00%