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Financing Arrangements (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 09, 2016
Apr. 04, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]                
Interest Expense, Debt, Excluding Amortization     $ 2,032,000 $ 2,032,000   $ 6,096,000 $ 4,063,000  
Convertible Debt, Fair Value Disclosures     $ 289,100,000     $ 289,100,000    
Debt Instrument, Convertible, Remaining Discount Amortization Period     4 years 6 months          
Share Price     $ 5.20     $ 5.20    
Hedging Activity, Shares Covered 46,300,000              
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities     46,300,000          
Convertible Note Hedge, Strike Price $ 5.40              
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 8.50     $ 8.50    
Debt Instrument, Face Amount     $ 250,000,000     $ 250,000,000   $ 250,000,000
Debt Instrument, Unamortized Discount     (63,041,000)     (63,041,000)   (71,005,000)
Convertible Notes Payable, Noncurrent     $ 186,959,000     186,959,000   178,995,000
Proceeds from Debt, Net of Issuance Costs         $ 243,200,000      
Debt Instrument, Interest Rate, Stated Percentage   3.25%            
Debt Conversion, Converted Instrument, Amount   $ 1,000            
Debt Conversion, Converted Instrument, Shares Issued   185.1852            
Debt Instrument, Convertible, Conversion Price   $ 5.40            
Proceeds from Issuance of Warrants $ 35,495,000         $ 0 35,495,000  
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   150.00%            
Debt Instrument, Convertible, Threshold Trading Days   20            
Debt Instrument, Interest Rate, Effective Percentage     9.75%     9.75%    
Debt Issuance Cost   $ 6,800,000            
Deferred Finance Costs, Net   4,800,000            
Amortization of Debt Discount (Premium)     $ 2,722,000 2,458,000   $ 7,964,000 4,854,000  
Interest Expense, Debt     $ 4,754,000 $ 4,490,000   14,060,000 $ 8,917,000  
Senior Notes [Member]                
Debt Instrument [Line Items]                
Convertible Debt   250,000,000            
Additional Paid-in Capital [Member]                
Debt Instrument [Line Items]                
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt           $ 67,014,000   $ 67,014,000
Transaction Costs [Member]                
Debt Instrument [Line Items]                
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt   $ 2,000,000            
Excluding Transaction Costs [Member]                
Debt Instrument [Line Items]                
Payments for Derivative Instrument, Financing Activities $ 59,100,000