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Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 18, 2015
May 31, 2011
Dec. 31, 2019
Dec. 31, 2018
Apr. 23, 2018
Dec. 31, 2017
Nov. 30, 2015
Long-term debt [Abstract]              
Maximum amount of debt and equity to be issued under Shelf Registration         $ 500,000    
AC 4% PIK Note [Member]              
Long-term debt [Abstract]              
Face value of debt             $ 250,000
Debt instrument, interest rate     4.00%       4.00%
Debt instrument, maturity date     Nov. 30, 2020        
Prepayment of debt       $ 50,000      
Repayment of debt     $ 0 $ 50,000      
5.875% Senior Notes [Member]              
Long-term debt [Abstract]              
Debt instrument, term     10 years        
Face value of debt $ 100,000 $ 100,000 $ 24,200        
Debt instrument, interest rate   5.875% 5.875% 5.875%      
Debt issuance cost     $ 34 $ 57      
Debt instrument, maturity date     Jun. 01, 2021        
Debt redemption price 101.00% 101.00%          
Debt instrument, repurchased face amount $ 75,800            
AC 1.6% Note [Member]              
Long-term debt [Abstract]              
Debt instrument, interest rate     1.60%     1.60%  
Debt instrument, maturity date       Feb. 28, 2018      
Repayment of debt     $ 0 $ 15,000      
Loans borrowed in exchange for a note           $ 15,000