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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Liabilities:    
Short-term debt $ 147,000 $ 138,000
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 22,559 13,055
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 0 0
Money market fund 521 5,017
Restricted marketable securities:    
Time deposits with original maturities of more than three months 0 0
Total 23,080 18,072
Liabilities:    
Short-term debt 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 0 0
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 10,358 5,140
Money market fund 0 0
Restricted marketable securities:    
Time deposits with original maturities of more than three months 470 324
Total 10,828 5,464
Liabilities:    
Short-term debt 147,000 138,000
Total 147,000 138,000
Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 0 0
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 0 0
Money market fund 0 0
Restricted marketable securities:    
Time deposits with original maturities of more than three months 0 0
Total 0 0
Liabilities:    
Short-term debt 0 0
Total $ 0 $ 0