Assets and Liabilities Measured at Fair Value (Schedule of Realized and Unrealized Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Gain (Loss) on Investments [Line Items]
Realized and unrealized gains (losses) on financial instruments, net	$ (71,481)	$ 737,552
Indemnification obligation
Gain (Loss) on Investments [Line Items]
Realized and unrealized gains (losses) on financial instruments, net	28,717	0
Variable forward
Gain (Loss) on Investments [Line Items]
Realized and unrealized gains (losses) on financial instruments, net	8,743	0
Investment in Liberty Broadband
Gain (Loss) on Investments [Line Items]
Realized and unrealized gains (losses) on financial instruments, net	22,621	526,267
Equity securities
Gain (Loss) on Investments [Line Items]
Realized and unrealized gains (losses) on financial instruments, net	$ (131,562)	$ 211,285

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References + Details