Financial Instruments (Investment and Derivative Information) (Details) $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2016
USD ($)
| |
| Foreign Exchange Contract | |
| Fair Value Measurements | |
| Assets related to derivative instruments | $ 0 |
| Liabilities related to derivative instruments | 0 |
| Notional principal amount of foreign exchange contracts | 10,500 |
| Foreign Exchange Contract | Other Income Expense | Not Designated as Hedging Instrument | |
| Fair Value Measurements | |
| Foreign exchange contracts | $ (317) |
| Minimum | |
| Fair Value Measurements | |
| Maturity period of long-term investments | 1 year |
| Maximum | |
| Fair Value Measurements | |
| Maturity period of long-term investments | 2 years |