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Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2015 | Jun. 30, 2015 | Apr. 30, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 27, 2015
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Short-term marketable securities |  |  |  | $ 77,685 | $ 9,014 |
Investments, at fair value |  |  |  | 484,084 | 439,560 |
Revolving Credit Facility |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 234,000
Time Warner |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Investments, at fair value |  |  |  | $ 483,917 | $ 438,912 |
Written call option | Time Warner |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  | 0 | 0 |
Cashless Collar |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Payments from settlements of financial instruments | $ 67,100 |  |  |  |  |
Cashless Collar | Time Warner |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Derivative share amount hedged |  |  |  |  |  | 1,700,000
Total | Recurring |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Cash equivalents |  |  |  | $ 775,379 | $ 639,956 |
Short-term marketable securities |  |  |  | 77,685 | 9,014 |
Available for sale securities | Total | Recurring |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Investments, at fair value |  |  |  | 484,084 | $ 439,560 |
Expiration Date February 2015 | Written call option | Time Warner |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Derivative share amount hedged |  |  |  |  | 625,000 |
Expiration Date February 2016 | Written call option | Time Warner |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Payments from settlements of financial instruments |  | $ 48,300 |  |  |  |
Expiration Date May 2015 | Written call option | Time Warner |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Derivative share amount hedged |  |  |  |  | 625,000 |
Payments from settlements of financial instruments |  |  | $ 36,700 |  |  |
Quoted prices in active markets for identical assets (Level 1) | Recurring |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Cash equivalents |  |  |  | 775,379 | $ 639,956 |
Short-term marketable securities |  |  |  | 77,685 | 9,014 |
Quoted prices in active markets for identical assets (Level 1) | Available for sale securities | Recurring |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value |  |  |  |  |  |
Investments, at fair value |  |  |  | $ 484,084 | $ 439,560 |

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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