14. Valuation and Qualifying Accounts (in thousands) | | | | | | | | | | | | | | | | | | Balance at Beginning of Period
| | Charged/ (Credited) to Revenues and Expenses | | Write-Off of Previously Provided Accounts | | Balance at End of Period | Year Ended December 31, 2013: | | | | | | | | Allowance for Doubtful Accounts | $ | 430 |
| | $ | 55 |
| | $ | 132 |
| | $ | 353 |
| Allowance for Customer Returns and Sales Credits | $ | 429 |
| | $ | 5,375 |
| | $ | 5,274 |
| | $ | 530 |
| | | | | | | | | Year Ended December 31, 2012: | | | | | | | | Allowance for Doubtful Accounts | $ | 390 |
| | $ | 48 |
| | $ | 8 |
| | $ | 430 |
| Allowance for Customer Returns and Sales Credits | $ | 1,411 |
| | $ | 4,265 |
| | $ | 5,247 |
| | $ | 429 |
| | | | | | | | | Year Ended December 31, 2011: | | | | | | | | Allowance for Doubtful Accounts | $ | 361 |
| | $ | 30 |
| | $ | 1 |
| | $ | 390 |
| Allowance for Customer Returns and Sales Credits | $ | 584 |
| | $ | 6,750 |
| | $ | 5,923 |
| | $ | 1,411 |
|
14. Valuation and Qualifying Accounts (in thousands) | | | | | | | | | | | | | | | | | | Balance at Beginning of Period
| | Charged/ (Credited) to Revenues and Expenses | | Write-Off of Previously Provided Accounts | | Balance at End of Period | Year Ended December 31, 2013: | | | | | | | | Allowance for Doubtful Accounts | $ | 430 |
| | $ | 55 |
| | $ | 132 |
| | $ | 353 |
| Allowance for Customer Returns and Sales Credits | $ | 429 |
| | $ | 5,375 |
| | $ | 5,274 |
| | $ | 530 |
| | | | | | | | | Year Ended December 31, 2012: | | | | | | | | Allowance for Doubtful Accounts | $ | 390 |
| | $ | 48 |
| | $ | 8 |
| | $ | 430 |
| Allowance for Customer Returns and Sales Credits | $ | 1,411 |
| | $ | 4,265 |
| | $ | 5,247 |
| | $ | 429 |
| | | | | | | | | Year Ended December 31, 2011: | | | | | | | | Allowance for Doubtful Accounts | $ | 361 |
| | $ | 30 |
| | $ | 1 |
| | $ | 390 |
| Allowance for Customer Returns and Sales Credits | $ | 584 |
| | $ | 6,750 |
| | $ | 5,923 |
| | $ | 1,411 |
|
|