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Fair Value Measurements Classes of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and Cash Equivalents |  | $ 375,172 | $ 316,264 |
Investments - Consolidated Investment Companies - Equity Securities |  | 2,337 | 6,170 |
Investments - Consolidated Investment Companies - Debt Securities |  | 31,266 | 39,241 |
Investments - Affiliates and Other- Equity Securities |  | 5,848 | 4,866 |
Investments - Affiliates and other - Debt Securities |  | 2,938 | 2,997 |
Other assets | [1] | 1,035 | 1,240 |
Derivative Liability |  | 28,978 |  |
Other Liabilities | [2] | 1,213 |  |
Level 1 [Member] |  |  |  |
Cash and Cash Equivalents |  | 375,172 | 205,364 |
Investments - Consolidated Investment Companies - Equity Securities |  | 1,586 | 5,424 |
Investments - Consolidated Investment Companies - Debt Securities |  | 0 | 0 |
Investments - Affiliates and Other- Equity Securities |  | 5,563 | 4,564 |
Investments - Affiliates and other - Debt Securities |  | 0 | 0 |
Other assets | [1] | 583 | 123 |
Other Liabilities | [2] | 12 |  |
Level 2 [Member] |  |  |  |
Cash and Cash Equivalents |  | 0 | 0 |
Investments - Consolidated Investment Companies - Equity Securities |  | 751 | 746 |
Investments - Consolidated Investment Companies - Debt Securities |  | 31,266 | 39,241 |
Investments - Affiliates and Other- Equity Securities |  | 0 | 0 |
Investments - Affiliates and other - Debt Securities |  | 2,938 | 2,997 |
Other assets | [1] | 0 | 357 |
Other Liabilities | [2] | 273 |  |
Level 3 [Member] |  |  |  |
Cash and Cash Equivalents |  | 0 | 0 |
Investments - Consolidated Investment Companies - Equity Securities |  | 0 | 0 |
Investments - Consolidated Investment Companies - Debt Securities |  | 0 | 0 |
Investments - Affiliates and Other- Equity Securities |  | 0 | 0 |
Investments - Affiliates and other - Debt Securities |  | 0 | 0 |
Other assets | [1] | 452 | 760 |
Other Liabilities | [2] | 928 |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
NAV Practical Expedient |  | 285 | 111,202 |
Cash and Cash Equivalents [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
NAV Practical Expedient |  | 0 | 110,900 |
Equity Securities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
NAV Practical Expedient |  | 285 | 302 |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Total Financial Assets |  | 418,596 | 370,778 |
Total Financial Liabilities |  | 30,191 | 1,203 | [2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |
Total Financial Assets |  | 382,904 | 215,475 |
Total Financial Liabilities |  | 12 | 0 | [2]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |
Total Financial Assets |  | 34,955 | 43,341 |
Total Financial Liabilities |  | 29,251 | 0 | [2]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |
Total Financial Assets |  | 452 | 760 |
Total Financial Liabilities |  | $ 928 | $ 1,203 | [2]
[1] | Amounts include restricted cash, structured trade finance loans held by Federated as well as futures contracts and/or foreign currency forward contracts held within certain consolidated Federated Funds.
[2] | Amounts include acquisition-related future contingent consideration liabilities as well as certain liabilities attributable to structured trade finance loans held by Federated and may include foreign currency forward contracts and/or futures contracts held within certain consolidated Federated Funds.

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