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Debt - Senior Unsecured Notes Exchangeable (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2014
USD ($)
d
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Senior unsecured notes, net   $ 1,046,219,000 $ 707,895,000  
Interest expense   79,623,000 68,473,000 $ 70,595,000
Amortization of deferred financing costs   $ 4,100,000 4,700,000 5,000,000
Convertible Debt | Senior unsecured notes - exchangeable        
Debt Instrument [Line Items]        
Face amount $ 250,000,000      
Stated interest rate 2.625% 2.625%    
Conversion price (USD per share) | $ / shares $ 19.45 $ 19.23    
Debt, conversion ratio 0.0514059 0.0520116    
Percentage of principal amount redeemed 100.00%      
Effective interest rate 3.80% 3.93%    
Senior unsecured notes, net $ 236,600,000      
Embedded conversion option   $ 13,400,000 13,400,000  
Remaining discount amortization period 5 years      
Unamortized discount   1,600,000 4,300,000  
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 9,900,000 9,900,000
Interest expense   6,600,000 6,600,000 6,600,000
Accretion of debt discount   2,700,000 2,700,000 2,700,000
Amortization of deferred financing costs   $ 600,000 $ 600,000 $ 600,000
Covenant scenario one | Convertible Debt | Senior unsecured notes - exchangeable        
Debt Instrument [Line Items]        
Threshold percentage of stock price trigger 130.00%      
Threshold trading days | d 20      
Threshold consecutive trading days | d 30      
Covenant scenario two | Convertible Debt | Senior unsecured notes - exchangeable        
Debt Instrument [Line Items]        
Threshold percentage of stock price trigger 98.00%      
Threshold consecutive business days 5 days