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DEBT (Details) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Mar. 13, 2017
Jan. 23, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 07, 2017
Debt:            
Settlement Period - Convertible Debt Conversion Request 40 days          
Share Price     $ 43.02      
Debt Conversion, Converted Instrument, Shares Issued       2.5    
Debt Instrument, Convertible, Conversion Value     $ 200,000      
Loss on early extinguishment of debt     0 $ 3,732,000 $ 0  
Convertible Senior Notes Due 2022 [Member]            
Debt:            
Debt Instrument, Convertible, Conversion Ratio 14.9491          
Debt Instrument, Convertible, Conversion Price $ 66.89          
Debt Instrument, Conversion Obligation Premium on Common Stock 37.50%          
Share Price           $ 48.65
Debt Redemption Price Due to Fundamental Change as Percentage of Principal Amount 100.00%          
Convertible Debt $ 274,100,000          
Debt Instrument, Convertible, Assumed Borrowing Rate 7.45%          
Debt Instrument, Convertible, Carrying Amount of Equity Component $ 70,900,000          
Debt Related Commitment Fees and Debt Issuance Costs $ 11,000,000          
Debt Issuance Costs, Amortization period 5 years          
Debt Instrument, Customary Events of Default, Percentage of Principal and Accrued and Unpaid Interest Due and Payable Upon Default 100.00%          
Convertible Senior Notes Due 2022 [Member] | Debt Conversion Terms Business Day Immediately Preceding October 1, 2021 [Member]            
Debt:            
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days 20 days          
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days 30 days          
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price 130.00%          
Debt Instrument Conversion Obligation Number of Consecutive Business Days after Consecutive Trading Day Period 5 days          
Debt Instrument, Conversion Obligation Period of Consecutive Trading Days 5 days          
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock $ 1,000   1,000      
Debt Instrument, Conversion Obligation Trading Price as Percentage of Product of Last Reported Common Stock Sale Price and Conversion Rate Maximum 98.00%          
Debt Instrument, Market Price     $ 998      
Convertible Senior Notes Due 2022 [Member] | Debt Redemption Terms on or after April 1, 2020 [Member]            
Debt:            
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days 20 days          
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days 30 days          
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price 130.00%          
Debt Instrument Conversion Obligation Number of Trading Days Prior to Date on which Entity Provides Notice of Redemption 5 days          
Debt Instrument, Percentage of Principal Amount for Computation of Redemption Price 100.00%          
Convertible debt            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   3.25% 3.25%      
Debt:            
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock $ 1,000          
Debt Instrument, Convertible, Conversion Price     $ 24.82      
Gross Proceeds From Issuance of Debt   $ 120,000,000        
Debt Instrument, Repurchased Face Amount       118,200,000    
Unsecured Debt | Convertible Senior Notes Due 2022 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Gross     $ 345,000,000 345,000,000    
Proceeds from Issuance of Debt $ 345,000,000          
Debt Instrument, Interest Rate, Stated Percentage 2.375%          
Debt:            
Debt Issuance Costs, Net     (5,850,000) (7,482,000)    
Discount on debt     (48,558,000) (61,345,000)    
Total debt, net of debt discount     290,592,000 276,173,000    
Proceeds from Convertible Debt, Net $ 334,000,000          
Unsecured Debt | Convertible debt            
Debt:            
Long-term Debt, Gross     $ 338,000 $ 338,000