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Financial Instruments and Fair Value (Tables)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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| Financial Instruments and Fair Value [Abstract] |
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| Summary of Investments [Table Text Block] |
The following table summarizes our investments ($ amounts in 000’s): | | | | | | | | | | | | | | December 31, 2013 | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | Corporate debt securities | 603,185 |
| | 1,506 |
| | (374 | ) | | 604,317 |
| Commercial paper | 69,356 |
| | 7 |
| | — |
| | 69,363 |
| Municipal bonds | 38,815 |
| | 48 |
| | (20 | ) | | 38,843 |
| Certificates of deposit and term deposits | 12,645 |
| | 3 |
| | — |
| | 12,648 |
| U.S. government and agency securities | 2,000 |
| | 1 |
| | — |
| | 2,001 |
| Total available-for-sale securities | 726,001 |
| | 1,565 |
| | (394 | ) | | 727,172 |
| | | | | | | | | | December 31, 2012 | | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | Corporate debt securities | 529,738 |
| | 1,814 |
| | (161 | ) | | 531,391 |
| Commercial paper | 39,229 |
| | 22 |
| | (6 | ) | | 39,245 |
| Municipal bonds | 36,787 |
| | 83 |
| | — |
| | 36,870 |
| Certificates of deposit and term deposits | 9,099 |
| | 6 |
| | — |
| | 9,105 |
| Total available-for-sale securities | 614,853 |
| | 1,925 |
| | (167 | ) | | 616,611 |
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| Schedule of Unrealized Loss on Investments [Table Text Block] |
The following table shows the gross unrealized losses and the related fair values of our investments that have been in a continuous unrealized loss position ($ amounts in 000’s):
| | | | | | | | | | | | | | | | | | | | December 31, 2013 | | Less Than 12 Months | | 12 Months or Greater | | Total | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | Corporate debt securities | 182,795 |
| | (374 | ) | | 500 |
| | — |
| | 183,295 |
| | (374 | ) | Commercial paper | 7,897 |
| | — |
| | — |
| | — |
| | 7,897 |
| | — |
| Municipal bonds | 14,736 |
| | (20 | ) | | — |
| | — |
| | 14,736 |
| | (20 | ) | Total available-for-sale securities | 205,428 |
| | (394 | ) | | 500 |
| | — |
| | 205,928 |
| | (394 | ) |
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The following table shows the gross unrealized losses and the related fair values of our investments that have been in a continuous unrealized loss position ($ amounts in 000’s):
| | | | | | | | | | | | | | | | | | | | December 31, 2012 | | Less Than 12 Months | | 12 Months or Greater | | Total | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | Corporate debt securities | 133,006 |
| | (156 | ) | | 5,010 |
| | (5 | ) | | 138,016 |
| | (161 | ) | Commercial paper | 8,464 |
| | (6 | ) | | — |
| | — |
| | 8,464 |
| | (6 | ) | Total available-for-sale securities | 141,470 |
| | (162 | ) | | 5,010 |
| | (5 | ) | | 146,480 |
| | (167 | ) |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The contractual maturities of our investments are as follows ($ amounts in 000’s) | | | | | | | | December 31,
2013 | | December 31,
2012 | Due within one year | 375,497 |
| | 290,719 |
| Due within one to three years | 351,675 |
| | 325,892 |
| Total | 727,172 |
| | 616,611 |
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| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
The following table presents the fair value of our financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2013 and December 31, 2012 ($ amounts in 000’s): | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2013 | | | | December 31, 2012 | | | | Aggregate Fair Value | | Quoted Prices in Active Markets For Identical Assets | | Significant Other Observable Remaining Inputs | | Significant Other Unobservable Remaining Inputs | | Aggregate Fair Value | | Quoted Prices in Active Markets For Identical Assets | | Significant Other Observable Remaining Inputs | | Significant Other Unobservable Remaining Inputs | | | | (Level 1) | | (Level 2) | | (Level 3) | | | | (Level 1) | | (Level 2) | | (Level 3) | Assets: | | | | | | | | | | | | | | | | Corporate debt securities | 604,317 |
| | — |
| | 604,317 |
| | — |
| | 531,391 |
| | — |
| | 531,391 |
| | — |
| Commercial paper | 71,363 |
| | — |
| | 71,363 |
| | — |
| | 41,994 |
| | — |
| | 41,994 |
| | — |
| Municipal bonds | 38,843 |
| | — |
| | 38,843 |
| | — |
| | 36,870 |
| | — |
| | 36,870 |
| | — |
| Certificates of deposit and term deposits | 12,648 |
| | — |
| | 12,648 |
| | — |
| | 9,105 |
| | — |
| | 9,105 |
| | — |
| Money market funds | 5,724 |
| | 5,724 |
| | — |
| | — |
| | 39,871 |
| | 39,871 |
| | — |
| | — |
| U.S. government and agency securities | 2,001 |
| | — |
| | 2,001 |
| | — |
| | — |
| | — |
| | — |
| | — |
| Total | 734,896 |
| | 5,724 |
| | 729,172 |
| | — |
| | 659,231 |
| | 39,871 |
| | 619,360 |
| | — |
| | | | | | | | | | | | | | | | | Liabilities: | | | | | | | | | | | | | | | | Contingent consideration | 1,850 |
| | — |
| | — |
| | 1,850 |
| | — |
| | — |
| | — |
| | — |
| Total | 1,850 |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | | | | | | | | | | | | | | | | Reported as: | | | | | | | | | | | | | | | | Cash equivalents | 7,724 |
| | | | | | | | 42,620 |
| | | | | | | Short-term investments | 375,497 |
| | | | | | | | 290,719 |
| | | | | | | Long-term investments | 351,675 |
| | | | | | | | 325,892 |
| | | | | | | Total | 734,896 |
| | | | | | | | 659,231 |
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| Fair Value Inputs, Liabilities, Quantitative Information [Table Text Block] |
The following table presents quantitative information about the inputs and valuation methodologies used for our fair value measurements classified in Level 3 of the fair value hierarchy as of December 31, 2013 ($ amounts in 000’s):
| | | | | | | | | | December 31, 2013 | | Fair Value | | Valuation Technique | | Significant Unobservable Input | | Range | Contingent consideration | $1,850 | | Probability Weighted Income Approach | | Revenue (in 000's) | | $7,000 - $12,000 | | | | | | | | | | | | | | Probability of occurrence (%) | | 40%-80% |
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