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Hedging Transactions and Derivative Financial Instruments (Additional Information) (Details) (USD $)
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3 Months Ended | |||
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Mar. 31, 2015
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Dec. 31, 2014
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Jul. 13, 2011
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Jul. 31, 2013
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| Derivative Instruments and Hedging Activities Disclosure [Line Items] | ||||
| Revolving credit outstanding borrowings | $ 0 | $ 0 | $ 100,000,000 | |
| Interest rate spread over variable rate (percent) | 1.75% | |||
| Bank Term Loan [Member] | ||||
| Derivative Instruments and Hedging Activities Disclosure [Line Items] | ||||
| Number of derivative contracts related to minimizing risk associated with potential rise in copper prices (contract) | 17 | |||
| Interest rate swap derivative, percentage of debt hedged (percent) | 65.00% | |||
| Term loan debt | 55,000,000 | |||
| Revolving credit outstanding borrowings | $ 125,000,000 | |||
| LIBOR [Member] | Bank Term Loan [Member] | ||||
| Derivative Instruments and Hedging Activities Disclosure [Line Items] | ||||
| Variable interest rate (percent) | 0.1875% | |||
| Interest rate spread over variable rate (percent) | 1.75% |