Fair Value Measurements Financial Assets and Liabilities Measured on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | $ 10,986 | $ 11,995 |
Securities sold, but not yet purchased | 131 | 268 |
Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 115,767 | 252,393 |
Securities owned — trading | 10,986 | 11,995 |
Other assets | 123,283 | 103,312 |
Total assets at fair value | 250,036 | 367,700 |
Securities sold, but not yet purchased | 131 | 268 |
Accounts payable and accrued liabilities | 547 | 527 |
Total liabilities at fair value | 678 | 795 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 115,767 | 252,393 |
Securities owned — trading | 10,906 | 11,892 |
Other assets | 120,327 | 99,962 |
Total assets at fair value | 247,000 | 364,247 |
Securities sold, but not yet purchased | 116 | 268 |
Accounts payable and accrued liabilities | 0 | 0 |
Total liabilities at fair value | 116 | 268 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 0 | 0 |
Securities owned — trading | 80 | 103 |
Other assets | 2,956 | 3,350 |
Total assets at fair value | 3,036 | 3,453 |
Securities sold, but not yet purchased | 15 | 0 |
Accounts payable and accrued liabilities | 20 | 0 |
Total liabilities at fair value | 35 | 0 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash equivalents | 0 | 0 |
Securities owned — trading | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 0 | 0 |
Securities sold, but not yet purchased | 0 | 0 |
Accounts payable and accrued liabilities | 527 | 527 |
Total liabilities at fair value | 527 | 527 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 15 | 1 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 15 | 1 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 0 | 0 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 0 | 0 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 101 | 267 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 101 | 267 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 0 | 0 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 0 | 0 |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 15 | |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 0 | |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 15 | |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities sold, but not yet purchased | 0 | |
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 333 | 261 |
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 333 | 261 |
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 7,032 | 7,267 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 7,032 | 7,267 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 43 | 56 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 43 | 56 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 80 | 103 |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 80 | 103 |
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
U.S. treasury obligations | Fair Value, Measurements, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 3,498 | 4,308 |
U.S. treasury obligations | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 3,498 | 4,308 |
U.S. treasury obligations | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | 0 | 0 |
U.S. treasury obligations | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Securities owned — trading | $ 0 | $ 0 |