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Commitments and Contingencies - Additional Information (Details) € in Thousands, $ in Thousands | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2015 USD ($) | Feb. 28, 2015 EUR (€) | Dec. 31, 2016 USD ($) lawsuit | Dec. 31, 2016 EUR (€) lawsuit | Sep. 30, 2016 USD ($) | Sep. 30, 2016 EUR (€) | Jun. 30, 2016 USD ($) | Jun. 30, 2016 EUR (€) | Dec. 31, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2014 EUR (€) | Sep. 30, 2013 USD ($) | Sep. 30, 2013 EUR (€)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits | lawsuit |  |  | 2 | 2 |  |  |  |  |  |  |  |  |
KBCD Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  |  |  |  |  |  |  |  |  |  | 21.00% | 21.00%
BKB Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  | 9.34% | 9.34% |  |  |  |  |  |  |  |  |
Commitment to Invest in KBCD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to invest |  |  |  |  |  |  |  |  |  | $ 50,000 | € 38,000 | $ 50,000 | € 38,000
Unfunded Commitment, Champ L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to invest |  |  | $ 2,947 | € 2,802 | $ 2,947 | € 2,802 | $ 2,947 | € 2,802 |  |  |  |  |
Champ LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest | 48.00% | 48.00% |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 20,794 | € 16,314 |  |  |  |  |  |  |  |  |  |  |
Subsidiaries [Member] | Champ Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  |  |  |  |  |  |  |  | 59.00% | 59.00% |  |
Champ LP [Member] | KBC Bank Deutschland AG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% |  |
Commercial and Subordinate Mortgage Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded Commitment | $ |  |  |  |  |  |  |  |  | $ 170,365 |  |  |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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