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Restructuring Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring accrual and changes |  |  |  |  |  |  |  |  |  |  |
Charges | $ 1,360 | $ 924 | $ 1,139 | $ 2,910 | $ (34) | $ 359 | $ 1,416 | $ 3,205 | $ 10,739 | $ 6,333 | $ 4,946
Accrued liabilities |  |  |  |  |  |  |  |  |  |  |
Restructuring accrual and changes |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 54 |  |  |  | 0 | 1,221 | 54 | 0
Charges |  |  |  |  |  |  |  |  | 10,739 | 6,333 | 4,946
Payments |  |  |  |  |  |  |  |  | (11,420) | (5,166) | (4,892)
Other Adjustments |  |  |  |  |  |  |  |  | (42) | 0 | 0
Balance at the end of the period | 1,221 |  |  |  | 54 |  |  |  | 498 | 1,221 | 54
Accrued liabilities | Employment termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring accrual and changes |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 0 |  |  |  | 0 | 1,181 | 0 | 0
Charges |  |  |  |  |  |  |  |  | 10,739 | 6,333 | 4,883
Payments |  |  |  |  |  |  |  |  | (11,404) | (5,152) | (4,883)
Other Adjustments |  |  |  |  |  |  |  |  | (42) | 0 | 0
Balance at the end of the period | 1,181 |  |  |  | 0 |  |  |  | 474 | 1,181 | 0
Accrued liabilities | Facilities consolidation |  |  |  |  |  |  |  |  |  |  |
Restructuring accrual and changes |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 54 |  |  |  | $ 0 | 40 | 54 | 0
Charges |  |  |  |  |  |  |  |  | 0 | 0 | 63
Payments |  |  |  |  |  |  |  |  | (16) | (14) | (9)
Other Adjustments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Balance at the end of the period | $ 40 |  |  |  | $ 54 |  |  |  | $ 24 | $ 40 | $ 54

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