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Product Warranty Obligations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Changes in product warranty obligations [Roll Forward] |  |  |
Balance at beginning of period | $ 33,734 | $ 36,112 |
Payments | (6,723) | (5,694) |
Provision for warranties issued | 6,039 | 10,989 |
Charged to operations | (1,143) | (1,200) |
Balance at end of period | 31,907 | 40,207 |
Deferred revenue related to extended warranty coverage [Roll Forward] |  |  |
Balance at beginning of year | 23,092 | 13,473 |
Deferred revenue on extended warranty contracts sold | 2,219 | 2,138 |
Amortization of deferred revenue on extended warranty contracts | (679) | (569) |
Balance at end of year | 24,632 | 15,042 |
Product warranty obligations included in consolidated balance sheets [Abstract] |  |  |
Current portion - other accrued liabilities | 24,253 |  | 26,080
Long-term portion - other long-term liabilities | 7,654 |  | 7,654
Total | 31,907 |  | 33,734
Other accrued liabilities | 24,253 |  | 26,080
Other long-term liabilities | 7,654 |  | 7,654
Balance at end of period | 31,907 | 40,207 |
Deferred revenue related to extended warranty [Abstract] |  |  |
Current portion - other accrued liabilities | 4,865 |  | 3,325
Long-term portion - other long-term liabilities | 19,767 |  | 19,767
Total | 24,632 | 15,042 |
Product warranty obligations included in consolidated balance sheets [Abstract] |  |  |
Current portion - other accrued liabilities | 24,253 |  | 26,080
Long-term portion - other long-term liabilities | 7,654 |  | 7,654
Total | 31,907 |  | 33,734
Other accrued liabilities | 24,253 |  | 26,080
Other long-term liabilities | 7,654 |  | 7,654
Balance at end of period | $ 31,907 | $ 40,207 |

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