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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Liabilities:    
Short-term debt $ 180,000 $ 130,000
Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents:    
Time deposits with original maturities less than three months 5,918 39,619
Marketable securities available-for-sale:    
Time deposit with original maturities more than three months 0 0
Money market fund 13,083 2,219
Restricted marketable securities:    
Time deposits with original maturities of more than three months 0 0
Total assets 19,001 41,838
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 5,428 158
Money market fund 0 0
Restricted marketable securities:    
Time deposits with original maturities of more than three months 563 337
Total assets 5,991 495
Liabilities:    
Short-term debt 180,000 130,000
Total liabilities 180,000 130,000
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