Accounting Policies - Additional Information (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2016
USD ($)
Facilities
|
Dec. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
|
|
| Accounting Policies [Abstract] | |||
| Research and development expense | $ 17,123,000 | $ 18,677,000 | $ 23,149,000 |
| Advertising expense | $ 13,593,000 | $ 9,203,000 | $ 13,463,000 |
| Number of subsidiaries | Facilities | 2 | ||
| Unremitted earnings of foreign subsidiaries | $ 32,700,000 | ||