Commitments and Contingencies (Changes To Warranty Liability) (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Movement in Standard Product Warranty Accrual [Roll Forward] | ||
| Warranty liabilities, beginning of period | $ 61,360 | $ 65,389 |
| Reserves provided | 12,319 | 8,841 |
| Payments | (12,743) | (16,829) |
| Warranty liabilities, end of period | $ 60,936 | $ 57,401 |