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Debt - Senior Unsecured Notes (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 15, 2014
USD ($)
d
$ / shares
shares
Dec. 31, 2013
USD ($)
Oct. 06, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2015
USD ($)
Debt Instrument [Line Items]              
Proceeds from mortgage notes payable   $ 0   $ 0 $ 191,000,000    
Senior unsecured notes       587,018,000 234,980,000    
Interest expense   $ 13,147,000 $ 50,660,000 67,492,000 66,456,000    
Amortization of deferred financing costs       $ 6,100,000 7,600,000 $ 12,700,000  
Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member]              
Debt Instrument [Line Items]              
Face amount $ 250,000,000            
Stated Rate 2.625%     2.63%      
Proceeds from mortgage notes payable $ 246,900,000            
Shares converted | shares 51.4059            
Conversion price | $ / shares $ 19.45            
Percentage of principal amount redeemed 100.00%            
Effective interest rate 3.80%     3.93%      
Senior unsecured notes $ 236,600,000            
Embedded conversion option       $ 13,400,000 13,400,000    
Remaining discount amortization period 5 years            
Unamortized discount       9,700,000 12,300,000    
Underwriting expense $ 3,100,000            
Deferred finance costs $ 2,900,000            
Embedded conversion feature, embedded       200,000 200,000    
Interest expense on note       9,900,000 3,800,000    
Interest expense       6,600,000 2,500,000    
Accretion of debt discount       2,700,000 1,100,000    
Amortization of deferred financing costs       $ 600,000 $ 200,000    
Senior Notes [Member] | Series A, Series B, and Series C Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Face amount             $ 350,000,000
Senior Notes [Member] | Series A Senior Notes due 2025 [Member]              
Debt Instrument [Line Items]              
Face amount             $ 100,000,000
Stated Rate       3.93%     3.93%
Effective interest rate       3.93%      
Senior Notes [Member] | Series B Senior Notes due 2027 [Member]              
Debt Instrument [Line Items]              
Face amount             $ 125,000,000
Stated Rate       4.09%     4.09%
Effective interest rate       4.09%      
Senior Notes [Member] | Series C Senior Notes due 2030 [Member]              
Debt Instrument [Line Items]              
Face amount             $ 125,000,000
Stated Rate       4.18%     4.18%
Effective interest rate       4.18%      
Covenant Scenario One [Member] | Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member]              
Debt Instrument [Line Items]              
Threshold Percentage of Stock Price Trigger 130.00%            
Debt Instrument, Convertible, Threshold Trading Days | d 20            
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30 days            
Covenant Scenario Two [Member] | Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member]              
Debt Instrument [Line Items]              
Threshold Percentage of Stock Price Trigger 98.00%            
Debt Instrument, Convertible, Threshold Consecutive Business Days 5 days