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Fair Value Measurement of Assets and Liabilities (Fair Value of Money Market Funds, Short and Long-Term Investments Classified as Available for Sale Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 373,266 $ 346,677
Gross Unrealized Gains 217 25
Gross Unrealized Losses [1] (260) (603)
Estimated Fair Value 373,223 346,099
Cash and Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 65,145 50,540
Gross Unrealized Gains 33 2
Gross Unrealized Losses [1] (3) (43)
Estimated Fair Value 65,175 50,499
Time Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 98,763 90,414
Gross Unrealized Gains 13 1
Gross Unrealized Losses [1] (52) (80)
Estimated Fair Value 98,724 90,335
Long-Term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 209,358 205,723
Gross Unrealized Gains 171 22
Gross Unrealized Losses [1] (205) (480)
Estimated Fair Value 209,324 205,265
Money Market Funds [Member] | Cash and Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 52,781 37,531
Gross Unrealized Gains 33 2
Gross Unrealized Losses [1]   (38)
Estimated Fair Value 52,814 37,495
Sovereign Debt Securities [Member] | Cash and Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 327  
Estimated Fair Value 327  
Sovereign Debt Securities [Member] | Time Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 3,273 4,726
Gross Unrealized Gains 0  
Gross Unrealized Losses [1] (6) (4)
Estimated Fair Value 3,267 4,722
Sovereign Debt Securities [Member] | Long-Term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 52,489 44,511
Gross Unrealized Gains 62  
Gross Unrealized Losses [1] (2) (83)
Estimated Fair Value 52,549 44,428
Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 12,037 13,009
Gross Unrealized Losses [1] (3) (5)
Estimated Fair Value 12,034 13,004
Corporate Debt Securities [Member] | Time Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 88,476 81,886
Gross Unrealized Gains 9  
Gross Unrealized Losses [1] (46) (75)
Estimated Fair Value 88,439 81,811
Corporate Debt Securities [Member] | Long-Term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 154,369 157,205
Gross Unrealized Gains 108 22
Gross Unrealized Losses [1] (203) (395)
Estimated Fair Value 154,274 156,832
Certificates of Deposit [Member] | Time Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 7,014 3,802
Gross Unrealized Gains 4 1
Gross Unrealized Losses [1]   (1)
Estimated Fair Value 7,018 3,802
Certificates of Deposit [Member] | Long-Term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 2,500 4,007
Gross Unrealized Gains 1  
Gross Unrealized Losses [1]   (2)
Estimated Fair Value $ 2,501 $ 4,005
[1] Unrealized losses from securities are primarily attributable to market price movements. Management does not believe any remaining unrealized losses represent other-than-temporary impairments based on the evaluation of available evidence including the credit rating of the investments, as of June 30, 2015 and December 31, 2014.