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Derivative Financial Instruments and Related Hedging Programs, Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Mar. 31, 2010
Derivative [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | $ (3,400,000) | $ (6,800,000) | $ 3,900,000 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (300,000) | 0 | $ 0 |  |
Aggregate fair value of derivative instruments in a net liability position | (14,600,000) |  |  |  |
Derivative Asset | $ 1,600,000 | 85,700,000 |  |  |
2016 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage Of Natural Gas Purchases For Which The Company's Exposure To Fluctuations In Gas Prices Have Been Reduced | 73.00% |  |  |  |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 55.00% |  |  |  |
2017 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage Of Natural Gas Purchases For Which The Company's Exposure To Fluctuations In Gas Prices Have Been Reduced | 72.00% |  |  |  |
2018 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage Of Natural Gas Purchases For Which The Company's Exposure To Fluctuations In Gas Prices Have Been Reduced | 59.00% |  |  |  |
Purchase | Designated as Hedging Instrument | Swap contracts | Foreign Currency |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Liability, Notional Amount | $ 4,700,000 | $ 0 |  |  |
Derivative, Average Forward Exchange Rate | 1.1453 |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ 0 |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 0 |  |  |  |
Unrealized Gain (Loss) on Derivatives | (300,000) |  |  |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | $ 0 |  |  |  |
Purchase | Designated as Hedging Instrument | Swap contracts | Minimum | Foreign Currency |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Remaining Maturity | 1 month |  |  |  |
Purchase | Designated as Hedging Instrument | Swap contracts | Maximum | Foreign Currency |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Remaining Maturity | 12 months |  |  |  |
Convertible Notes | Convertible Notes Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Principal amount of notes |  |  |  |  | $ 175,000,000
Derivative Asset |  |  |  | $ 94,900,000 |

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