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Subsequent Events (Details) - USD ($)
6 Months Ended
Aug. 07, 2015
Jul. 27, 2015
Jul. 01, 2015
Jun. 30, 2015
Sep. 07, 2015
At-the-Market Program Renewed in August 2015 [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
At-the-Market program extension period 3 years        
Common stock authorized under At-the-Market program, value         $ 400,000,000
Term Loan With Maturity Date 10/2/2017 [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Remaining balance of term loan     $ 259,600,000    
Term loan, amount     $ 400,000,000    
Term Loan With Maturity Date Of 07/01/2022 [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Term loan, amount   $ 180,000,000      
Effective fixed rate, percent   3.06%      
Potential term extension, in years   2 years      
LIBOR [Member] | Term Loan With Maturity Date 10/2/2017 [Member]          
Subsequent Event [Line Items]          
Basis spread       2.00%  
LIBOR [Member] | Term Loan With Maturity Date Of 07/01/2022 [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Basis spread   1.45%