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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 |  |  |  |  |  |  |

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