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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Fair Value (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2015 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 79,365 | $ 46,186 |  | $ 46,186
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses | (21) | (1) |  |
Purchases | 20,351 | 9,365 |  |
Sales | (8,799) |  |  |
Settlements |  | 20 |  |
Amounts acquired |  | 19,970 |  |
Balance at end of the period | 73,843 | 75,522 |  | 79,365
Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (2,897) | 1,093 |  |
Net realized and unrealized (losses) gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (14,156) |  |  | (1,111)
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 74,634 | 54,545 |  | 54,545
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses | (21) | (1) |  |
Purchases | 20,962 | 10,262 |  |
Sales | (8,799) |  |  |
Settlements |  | 0 |  |
Amounts acquired |  | 0 |  |
Balance at end of the period | 72,620 | 63,695 |  | 74,634
Other investments | Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | 0 | 0 |  |
Other investments | Net realized and unrealized (losses) gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income |  |  | $ (1,111) | (14,156)
Other assets and (liabilities) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of the period | 4,731 | (8,359) |  | (8,359)
Total realized and unrealized losses |  |  |  |
Total foreign exchange losses | 0 | 0 |  |
Purchases | (611) | (897) |  |
Sales | 0 |  |  |
Settlements |  | 20 |  |
Amounts acquired |  | 19,970 |  |
Balance at end of the period | 1,223 | 11,827 |  | 4,731
Other assets and (liabilities) | Other income (loss) |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | (2,897) | $ 1,093 |  |
Other assets and (liabilities) | Net realized and unrealized (losses) gains on investments |  |  |  |
Total realized and unrealized losses |  |  |  |
Included in other (loss) income | $ 0 |  |  | $ 0

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- Definition Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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