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Borrowings - Senior Unsecured Notes (Details) (USD $)
0 Months Ended 6 Months Ended
May 12, 2014
Jun. 30, 2014
May 12, 2014
Debt Instrument, Redemption [Line Items]      
Change of control, purchase price, percentage   101.00%  
Unsecured Debt [Member] | 6.625% Senior Notes due 2019
     
Debt Instrument, Redemption [Line Items]      
Debt instrument, face amount     $ 350,000,000
Interest rate, stated percentage     6.625%
Proceeds from debt, net of issuance costs 343,800,000    
Days after the closing of the offering for the registration statement to become effective (on or prior to 270 days)   270 days  
Unamortized debt issuance expense   $ 6,100,000  
Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | Any time prior to May 15, 2016 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption price, percentage   100.00%  
Redemption of principal amount (up to 35%)   35.00%  
Use of cash proceeds from Equity Offerings, redemption price, percentage   106.625%  
Use of cash proceeds from Equity Offerings, minimum percentage of principal amount outstanding   65.00%  
Days after Equity Offering consummation for redemption (not more than 120 days)   120 days  
Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | 2016 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption price, percentage   104.969%  
Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | 2017 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption price, percentage   103.313%  
Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | 2018 and thereafter [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption price, percentage   100.00%  
Minimum [Member] | Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | Any time prior to May 15, 2016 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption period   30 days  
Additional premium, percentage of principal amount   1.00%  
Additional interest, percentage   0.25%  
Minimum [Member] | Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | On or after May 15, 2016 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption period   30 days  
Maximum [Member] | Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | Any time prior to May 15, 2016 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption period   60 days  
Additional interest, percentage   1.00%  
Maximum [Member] | Unsecured Debt [Member] | 6.625% Senior Notes due 2019 | On or after May 15, 2016 [Member]
     
Debt Instrument, Redemption [Line Items]      
Redemption period   60 days