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Long-Term Debt (Narrative) (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jan. 25, 2016 $ / shares | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount of notes issued | $ 325,000 | $ 325,000 |  | $ 0
Payment for capped call transactions |  | 38,500 |  |
Debt Cap Price |  |  | 9.73 |
Net proceeds received |  | $ 315,000 |  |
Sale of Stock, Price Per Share | $ / shares |  |  | $ 5.56 |
Debt Issuance Costs | 10,000 |  |  |
Amortization period |  | 7 year |  |
Capped Call Transactions Expenses | $ 900 |  |  |
Capped Call Transactions [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Conversion Premium, Percentage |  |  | 75.00% |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Convertible, Terms of Conversion Feature |  | In addition, the holders of the Notes may require the Company to repurchase the Notes at par value plus accrued and unpaid interest following the occurrence of a Fundamental Change (as described in the Indenture). If a holder of the Notes converts upon a Make-Whole Adjustment Event (as described in the Indenture), they may be eligible to receive a make-whole premium through an increase to the conversion rate up to a maximum of 179.8561 shares per $1,000 principal amount of Notes (subject to other adjustments as described in the Indenture). |  |
Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Convertible, Terms of Conversion Feature |  | The Notes are initially convertible into approximately 47,716,900 shares of the Company’s stock based on the initial conversion rate of 146.8213 shares of the Company’s common stock per $1,000 principal amount of the Notes. |  |
Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible Notes Payable, Maturity Date |  | Feb. 01, 2023 |  |
Conversion Premium, Percentage |  |  | 22.50% |
Annual Interest Rate of Notes (as a percent) |  | 3.75% |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  | $ 6.81 |

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