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Investments and Fair Value Measurements (Fair Value Measurements) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Assets:      
Equity securities at fair value that qualify for the NAV practical expedient   $ 71,019 $ 0
Liabilities:      
Fair value of derivatives embedded within convertible debt   40,785 76,413
Long-term investments, fair value   71,019 0
Long-term investments ($71,019 and $0 carried at fair value)   87,608 81,291
5.5% Variable Interest Senior Convertible Debentures due 2020 | Convertible Debt      
Liabilities:      
Fair value of derivatives embedded within convertible debt   $ 40,785 45,249
Interest rate   5.50%  
Fair Value, Measurements, Recurring      
Assets:      
Investment securities available for sale   $ 138,816 150,489
Equity securities at fair value that qualify for the NAV practical expedient   71,019  
Total   412,301 366,672
Liabilities:      
Fair value of derivatives embedded within convertible debt   65,846 76,413
Fair Value, Measurements, Recurring | Marketable equity securities      
Assets:      
Investment securities available for sale   40,561  
Fair Value, Measurements, Recurring | Mutual funds invested in fixed-income securities      
Assets:      
Investment securities available for sale   20,976 21,041
Fair Value, Measurements, Recurring | Total equity securities at fair value      
Assets:      
Investment securities available for sale   61,537 44,634
Fair Value, Measurements, Recurring | U.S. Government securities      
Assets:      
Investment securities available for sale   28,347 28,502
Fair Value, Measurements, Recurring | Corporate securities      
Assets:      
Investment securities available for sale   40,869 41,329
Fair Value, Measurements, Recurring | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   4,081 4,564
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   417 426
Fair Value, Measurements, Recurring | Commercial paper      
Assets:      
Investment securities available for sale     7,027
Fair Value, Measurements, Recurring | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   2,326 2,316
Fair Value, Measurements, Recurring | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   1,239 650
Fair Value, Measurements, Recurring | Total debt securities available for sale      
Assets:      
Investment securities available for sale   77,279 84,814
Fair Value, Measurements, Recurring | Money market funds      
Assets:      
Cash and cash equivalents   148,446 166,915
Fair Value, Measurements, Recurring | Commercial paper      
Assets:      
Cash and cash equivalents   51,029 43,781
Fair Value, Measurements, Recurring | Commercial paper | Current Restricted Assets      
Assets:      
Cash and cash equivalents   2,570  
Fair Value, Measurements, Recurring | Commercial paper | Restricted Assets      
Assets:      
Cash and cash equivalents   3,980  
Fair Value, Measurements, Recurring | Certificates of deposit      
Assets:      
Cash and cash equivalents   2,501 2,497
Fair Value, Measurements, Recurring | Money market funds securing legal bonds      
Assets:      
Cash and cash equivalents   490 2,990
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets:      
Investment securities available for sale   61,537 65,675
Equity securities at fair value that qualify for the NAV practical expedient   0  
Total   210,473 235,580
Liabilities:      
Fair value of derivatives embedded within convertible debt   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable equity securities      
Assets:      
Investment securities available for sale   40,561  
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds invested in fixed-income securities      
Assets:      
Investment securities available for sale   20,976 21,041
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities at fair value      
Assets:      
Investment securities available for sale   61,537 44,634
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper      
Assets:      
Investment securities available for sale     0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available for sale      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Assets:      
Cash and cash equivalents   148,446 166,915
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial paper      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds securing legal bonds      
Assets:      
Cash and cash equivalents   490 2,990
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)      
Assets:      
Investment securities available for sale   77,279 84,814
Total   201,828 131,092
Liabilities:      
Fair value of derivatives embedded within convertible debt   0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Marketable equity securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds invested in fixed-income securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Total equity securities at fair value      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government securities      
Assets:      
Investment securities available for sale   28,347 28,502
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities      
Assets:      
Investment securities available for sale   40,869 41,329
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   4,081 4,564
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   417 426
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper      
Assets:      
Investment securities available for sale     7,027
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   2,326 2,316
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   1,239 650
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Total debt securities available for sale      
Assets:      
Investment securities available for sale   77,279 84,814
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial paper      
Assets:      
Cash and cash equivalents   51,029 43,781
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit      
Assets:      
Cash and cash equivalents   2,501 2,497
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds securing legal bonds      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)      
Assets:      
Investment securities available for sale   0 0
Equity securities at fair value that qualify for the NAV practical expedient   0  
Total   0 0
Liabilities:      
Fair value of derivatives embedded within convertible debt   65,846 76,413
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Marketable equity securities      
Assets:      
Investment securities available for sale   0  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds invested in fixed-income securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Total equity securities at fair value      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Government securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. mortgage-backed securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper      
Assets:      
Investment securities available for sale     0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Index-linked U.S. bonds      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign fixed-income securities      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Total debt securities available for sale      
Assets:      
Investment securities available for sale   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Money market funds      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial paper      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Certificates of deposit      
Assets:      
Cash and cash equivalents   0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Money market funds securing legal bonds      
Assets:      
Cash and cash equivalents   $ 0 0
Fair Value, Measurements, Nonrecurring      
Liabilities:      
Long-term investments, fair value     4,475
Nonrecurring nonfinancial assets subject to fair value measurements     4,475
Gain (loss) on long-term investments $ (525)    
Gain (loss) on long-term investments and real estate held for sale (525)    
Long-term investments ($71,019 and $0 carried at fair value)     5,000
Impairment charge included in earnings $ (525)    
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)      
Liabilities:      
Long-term investments, fair value     4,475
Nonrecurring nonfinancial assets subject to fair value measurements     $ 4,475