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Debt (5.125% Senior Notes) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 19, 2013
Debt Instrument [Line Items]        
Capitalized loan costs $ 31,100,000 $ 42,300,000    
Loss on extinguishment of debt $ 0 $ 0 $ 15,885,000  
Senior Notes | 5.125% Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 300,000,000.0
Stated interest rate 5.125% 5.125%   5.125%
Debt covenant, asset proceeds, excess proceeds $ 25,000,000      
Debt covenant, indenture agreement, period after notice 60 days      
Percentage of principal amount redeemable 101.00%      
Redemption price calculation contributor, percentage 100.00%      
Senior Notes | 5.125% Senior Notes | Redemption, Period 2018        
Debt Instrument [Line Items]        
Redemption price percentage 102.563%      
Senior Notes | 5.125% Senior Notes | Redemption, Period 2019        
Debt Instrument [Line Items]        
Redemption price percentage 101.708%      
Senior Notes | 5.125% Senior Notes | Redemption, Period 2020        
Debt Instrument [Line Items]        
Redemption price percentage 100.854%      
Senior Notes | 5.125% Senior Notes | 2020 and thereafter        
Debt Instrument [Line Items]        
Redemption price percentage 100.00%      
Senior Notes | 5.125% Senior Notes | Minimum        
Debt Instrument [Line Items]        
Notice period prior to redemption 30 days      
Senior Notes | 5.125% Senior Notes | Maximum        
Debt Instrument [Line Items]        
Notice period prior to redemption 60 days