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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Recurring basis | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Total assets $ 1,595,368 $ 1,528,101
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities 1,743 4,162
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Total assets 280,351 627,133
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities 0 0
Recurring basis | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Total assets 1,304,727 897,627
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities 1,743 4,162
Recurring basis | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Total assets 10,291 3,341
Liabilities, Fair Value Disclosure [Abstract]    
Total liabilities 0 0
Cash and cash equivalents | Corporate securities
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 389  
Cash and cash equivalents | Corporate securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 0  
Cash and cash equivalents | Corporate securities | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 389  
Cash and cash equivalents | Corporate securities | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 0  
Cash and cash equivalents | Recurring basis | Cash | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 227,528 503,614
Cash and cash equivalents | Recurring basis | Cash | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 227,528 503,614
Cash and cash equivalents | Recurring basis | Cash | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 0 0
Cash and cash equivalents | Recurring basis | Cash | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 0 0
Cash and cash equivalents | Recurring basis | Money market funds | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 52,823 123,519
Cash and cash equivalents | Recurring basis | Money market funds | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 52,823 123,519
Cash and cash equivalents | Recurring basis | Money market funds | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 0 0
Cash and cash equivalents | Recurring basis | Money market funds | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents 0 0
Cash and cash equivalents | Recurring basis | Corporate securities | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents   16,476
Cash and cash equivalents | Recurring basis | Corporate securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents   0
Cash and cash equivalents | Recurring basis | Corporate securities | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents   16,476
Cash and cash equivalents | Recurring basis | Corporate securities | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Cash and cash equivalents   0
Available-for-sale securities | Recurring basis | Corporate securities | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 644,091 405,322
Available-for-sale securities | Recurring basis | Corporate securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Available-for-sale securities | Recurring basis | Corporate securities | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 633,801 401,981
Available-for-sale securities | Recurring basis | Corporate securities | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 10,291 3,341
Available-for-sale securities | Recurring basis | Agency securities | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 454,750 402,707
Available-for-sale securities | Recurring basis | Agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Available-for-sale securities | Recurring basis | Agency securities | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 454,750 402,707
Available-for-sale securities | Recurring basis | Agency securities | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Available-for-sale securities | Recurring basis | Municipal securities | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 53,756 32,313
Available-for-sale securities | Recurring basis | Municipal securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Available-for-sale securities | Recurring basis | Municipal securities | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 53,756 32,313
Available-for-sale securities | Recurring basis | Municipal securities | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Available-for-sale securities | Recurring basis | Government securities | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 157,079 39,993
Available-for-sale securities | Recurring basis | Government securities | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Available-for-sale securities | Recurring basis | Government securities | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 157,079 39,993
Available-for-sale securities | Recurring basis | Government securities | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale securities 0 0
Prepaid expenses and other current assets | Recurring basis | Estimate of fair value measurement
    
Assets, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 4,952 4,157
Prepaid expenses and other current assets | Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Assets, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 0 0
Prepaid expenses and other current assets | Recurring basis | Significant Other Observable Inputs (Level 2)
    
Assets, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 4,952 4,157
Prepaid expenses and other current assets | Recurring basis | Significant Unobservable Inputs (Level 3)
    
Assets, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 0 0
Accrued expenses and other current liabilities | Recurring basis | Estimate of fair value measurement
    
Liabilities, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 1,743 4,162
Accrued expenses and other current liabilities | Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)
    
Liabilities, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 0 0
Accrued expenses and other current liabilities | Recurring basis | Significant Other Observable Inputs (Level 2)
    
Liabilities, Fair Value Disclosure [Abstract]    
Foreign currency derivatives 1,743 4,162
Accrued expenses and other current liabilities | Recurring basis | Significant Unobservable Inputs (Level 3)
    
Liabilities, Fair Value Disclosure [Abstract]    
Foreign currency derivatives $ 0 $ 0