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Debt Senior Notes (Details)
$ / shares in Units, shares in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Jan. 15, 2021
Jan. 14, 2020
Jan. 14, 2019
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]          
Preferred Stock, Dividend Rate, Percentage 9.75%        
Restricted Payments Basket $ 137,700,000       $ 128,500,000
2021 Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 300,000,000        
Debt Instrument, Interest Rate, Stated Percentage 6.75%        
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   100.00% 101.688% 103.375%  
2017 Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Convertible senior subordinated notes $ 57,500,000        
Debt Instrument, Interest Rate, Stated Percentage 3.25%        
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        
2018 Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Convertible senior subordinated notes $ 86,250,000        
Debt Instrument, Interest Rate, Stated Percentage 3.00%        
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        
Base of restricted payments basket income calculation [Member]          
Debt Instrument [Line Items]          
Other Restrictions on Payment of Dividends $ 125,000,000        
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 our aggregate consolidated net income subtracted from base amount of calculation [Member]          
Debt Instrument [Line Items]          
Percent restrictions on payment of dividends 100.00%        
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%