Write Downs and Other Charges (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Write Downs And Other Charges [Abstract] | |||
| Write downs and other charges | $ 3,262 | $ 11,766 | $ 7,068 |
| Fees related to acquisition | 8,200 | 2,800 | |
| Impairment of intangible assets | 3,300 | 3,400 | 1,400 |
| Write-off of prepaids | 1,300 | ||
| Gain (loss) on sale of assets | 1,000 | 1,300 | 1,900 |
| Impairment of long-lived assets | 2,000 | 200 | $ 800 |
| Change in amount of contingent consideration | $ (3,000) | $ 2,700 | |