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Derivative Financial Instruments and Related Hedging Programs, Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |
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 (loss) gain on foreign currency cash flow hedges | (100,000) | $ (200,000) | 100,000 | $ (200,000) |  |  |
Accumulated other comprehensive loss related to cash flow hedges | (200,000) |  | (200,000) |  |  |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | 0 |  |  |  |  |  |
Derivative Financial Instruments and Related Hedging Programs (Textuals) [Abstract] |  |  |  |  |  |  |
Aggregate fair value of derivative instruments that contain credit-risk-related contingency features that were in a net liability position | $ 2,800,000 |  | $ 2,800,000 |  |  | $ 14,600,000 |
2017 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 54.00% |  | 54.00% |  | 54.00% |  |
Remainder of 2016 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 55.00% |  | 55.00% |  | 55.00% |  |
2018 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Percentage of Electricity Purchases For Which Company Exposure To Fluctuations In Electricity Prices Have Been Reduced | 36.00% |  | 36.00% |  | 36.00% |  |
Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Notional Amount | € |  |  |  |  | € 2,020,950 |  | € 4,700,000
Derivative, Average Forward Exchange Rate | 1.13 |  | 1.13 |  | 1.13 | 1.14 | 1.14
Minimum | Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Remaining Maturity |  |  | 3 months |  |  |  |
Maximum | Swap [Member] | Designated as Hedging Instrument [Member] | Foreign Currency Member | Purchase |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Remaining Maturity |  |  | 14 months |  |  |  |

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- Definition Percentage of Electricity Purchases For Which The Company's Exposure To Fluctuations In Electricity Prices Have Been Reduced + References No definition available. + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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