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Debt Senior Notes (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Jan. 15, 2021
Jan. 14, 2020
Jan. 14, 2019
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]          
Preferred Stock, Dividend Rate, Percentage       9.75%  
Restricted Payments Basket       $ 144,949,000 $ 128,550,000
2018 Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Convertible senior subordinated notes       $ 86,250,000  
Debt Instrument, Convertible, Conversion Ratio       30.9478  
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation       $ 1,000  
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 32.31  
Stock Issued During Period, Shares, Other | shares       2.7  
Debt Instrument, Interest Rate, Stated Percentage       3.00%  
2017 Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Convertible senior subordinated notes       $ 57,500,000  
Debt Instrument, Convertible, Conversion Ratio       42.0159  
Debt Instrument Convertible Principal Amount Used In Conversion Rate Calculation       $ 1,000  
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 23.80  
Stock Issued During Period, Shares, Other | shares       2.4  
Debt Instrument, Interest Rate, Stated Percentage       3.25%  
2021 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       6.75%  
Senior notes       $ 300,000,000  
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00% 101.688% 103.375%    
Percentage of our aggregate consolidated net income added to base amount of calculation [Member]          
Debt Instrument [Line Items]          
Percent restrictions on payment of dividends       50.00%  
Percentage of net cash proceeds from sale of qualified equity interests added to base and income/loss amount in calculation [Member]          
Debt Instrument [Line Items]          
Percent restrictions on payment of dividends       100.00%  
Percentage of our aggregate consolidated net income subtracted from base amount of calculation [Member]          
Debt Instrument [Line Items]          
Percent restrictions on payment of dividends       100.00%  
Base of restricted payments basket income calculation [Member]          
Debt Instrument [Line Items]          
Restrictions on payment of dividends       $ 125,000,000