XML 73 R63.htm IDEA: XBRL DOCUMENT v3.7.0.1
FINANCING ARRANGEMENTS (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Premiums to repay debt early $ 4,665,000 $ 0  
Outstanding loan balances 0   $ 0
Available to borrow and outstanding letters of credit 225,300,000   195,200,000
Outstanding letters of credit 125,900,000   132,600,000
Secured debt | Term Loan Agreement      
Debt Instrument [Line Items]      
Senior secured credit agreement amount $ 400,000,000.0    
Prepayment premium 1.00%    
Effective interest rate 3.23%    
Amount used to repurchase notes $ 312,600,000    
Repurchased amount 296,200,000    
Accrued interest paid 6,400,000    
Premiums to repay debt early 4,700,000    
Expenses incurred from financing 5,300,000    
Debt fair value 400,000,000    
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020      
Debt Instrument [Line Items]      
Senior secured credit agreement amount 503,800,000    
Repurchased amount $ 103,800,000    
Redemption price percentage 101.313%    
Debt fair value $ 510,700,000   820,000,000
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes)      
Debt Instrument [Line Items]      
Debt fair value 863,000,000   861,900,000
Revolving Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Revolving credit facility maximum borrowing capacity $ 400,000,000   $ 400,000,000
Eurodollar | Term Loan Agreement      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
Base Rate | Term Loan Agreement      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
Minimum | Base Rate | Term Loan Agreement      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.00%