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Warranty Reserves and Cost Per Hour Reserves - Additional Information (Narrative) (Details) (USD $)
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12 Months Ended | |||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Guarantees [Abstract] | ||||
| Standard Product Warranty Period Minimum | 2 years | |||
| Standard Product Warranty Period Maximum | 5 years | |||
| Product Warranty Expense Net | $ 0 | $ 0 | $ (500,000) | |
| Cost Per Hour Expense Net | 0 | 700,000 | 5,300,000 | |
| Cost Per Hour Liability Reserve | $ 0 | $ 511,000 | $ 3,569,000 | $ 2,770,000 |