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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Liabilities:    
Short-term debt $ 138,000 $ 180,000
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 13,055 5,918
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 0 0
Money market fund 5,017 13,083
Restricted marketable securities:    
Time deposits with original maturities of more than three months 0 0
Total assets 18,072 19,001
Liabilities:    
Short-term debt 0 0
Total liabilities 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 5,140 5,428
Money market fund 0 0
Restricted marketable securities:    
Time deposits with original maturities of more than three months 324 563
Total assets 5,464 5,991
Liabilities:    
Short-term debt 138,000 180,000
Total liabilities 138,000 180,000
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 assets 0 0
Liabilities:    
Short-term debt 0 0
Total liabilities $ 0 $ 0