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Income Tax Matters Income Tax Matters Narrative (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 26, 2016 $ / shares | Apr. 22, 2016 | Apr. 07, 2016 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2013 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  |  |  |  | $ 700,000 |  |  |
Operating Loss Carryforwards |  |  |  |  | $ 414,100,000 |  |  |  |
Tax Credit Carryforward, Amount |  |  |  |  | 26,800,000 |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  | (5,500,000) | 2,000,000 | $ (700,000) |  |
Unrecognized Tax Benefits |  |  |  |  | 1,800,000 | 1,700,000 | 2,200,000 |  | $ 3,800,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  |  |  | 700,000 | 600,000 | 1,100,000 |  |
Accrued interest and penalties on unrecognized tax benefits |  |  |  |  | 200,000 | 200,000 |  |  |
Accrued interest and penalties on unrecognized tax benefits, current |  |  |  |  | $ 0 |  |  |  |
(Decrease) increase in interest and penalty |  |  |  |  |  | (1,200,000) | (900,000) |  |
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which increased (decreased) Other comprehensive income (loss) |  |  |  |  |  | $ 100,000 | $ 300,000 |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  | $ 700,000 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Preferred Stock, Rights Conversion Ratio into Preferred Stock |  |  |  | 1 |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares |  | $ 400 |  |  |  |  |  |  |
Preferred Stock, Rights Waiting Period, Duration Before Exercisable After Public Announcement |  | 10 days |  |  |  |  |  |  |
Preferred Stock, Rights Waiting Period, Duration Before Exercisable After Tender or Exchange Offer Results in Becoming an Acquiring Person |  | 10 days |  |  |  |  |  |  |
Value of right to purchase shares of the acquiring or other appropriate entity |  |  | 2 |  |  |  |  |  |
[1] | See Note 5 and Note 8 for discussion of our adoption of ASU 2016-09 (as defined in Note 1).

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