Related Party Transactions	9 Months Ended
Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions AMTG Merger As fully described in "Note 17- Business Combination", in August 2016, the Company acquired AMTG, an entity managed by an affiliate of Apollo. Management Agreement In connection with the Company’s initial public offering in September 2009, the Company entered into a management agreement (the “Management Agreement”) with the Manager, which describes the services to be provided by the Manager and its compensation for those services. The Manager is responsible for managing the Company’s day-to-day operations, subject to the direction and oversight of the Company’s board of directors. Pursuant to the terms of the Management Agreement, the Manager is paid a base management fee equal to 1.5% per annum of the Company’s stockholders’ equity (as defined in the Management Agreement), calculated and payable (in cash) quarterly in arrears. The current term of the Management Agreement expires on September 29, 2018 and is automatically renewed for successive one-year terms on each anniversary thereafter. The Management Agreement may be terminated upon expiration of the one-year extension term only upon the affirmative vote of at least two-thirds of the Company’s independent directors, based upon (1) unsatisfactory performance by the Manager that is materially detrimental to the Company or (2) a determination that the management fee payable to the Manager is not fair, subject to the Manager’s right to prevent such a termination based on unfair fees by accepting a mutually acceptable reduction of management fees agreed to by at least two-thirds of the Company’s independent directors. The Manager must be provided with written notice of any such termination at least 180 days prior to the expiration of the then existing term and will be paid a termination fee equal to three times the sum of the average annual base management fee during the 24-month period immediately preceding the date of termination, calculated as of the end of the most recently completed fiscal quarter prior to the date of termination. Following a meeting by the Company’s independent directors in February 2017, which included a discussion of the Manager’s performance and the level of the management fees thereunder, the Company determined not to seek termination of the Management Agreement. For the three and nine months ended September 30, 2017, the Company incurred approximately $8,309 and $23,484, respectively, in base management fees under the Management Agreement. For the three and nine months ended September 30, 2016, the Company incurred approximately $5,903 and $16,374, respectively, in base management fees under the Management Agreement. In addition to the base management fee, the Company is also responsible for reimbursing the Manager for certain expenses paid by the Manager on behalf of the Company or for certain services provided by the Manager to the Company. For the three and nine months ended September 30, 2017, the Company paid expenses totaling $37 and $231 respectively, related to reimbursements for certain expenses paid by the Manager on behalf of the Company under the Management Agreement. For the three and nine months ended September 30, 2016, the Company paid expenses totaling $517 and $1,359, respectively, related to reimbursements for certain expenses paid by the Manager on behalf of the Company under the Management Agreement. Expenses incurred by the Manager and reimbursed by the Company are reflected in the respective condensed consolidated statement of operations expense category or the condensed consolidated balance sheet based on the nature of the item. Included in payable to related party on the condensed consolidated balance sheet at September 30, 2017 and December 31, 2016 are approximately $8,309 and $7,015, respectively, for base management fees incurred but not yet paid under the Management Agreement. Unconsolidated Joint Venture In September 2014, the Company, through a wholly owned subsidiary, acquired a 59% ownership interest in Champ LP following which a wholly-owned subsidiary of Champ LP then acquired a 35% ownership interest in BKB. The Company acquired its ownership interest in Champ LP for an initial purchase price paid at closing of approximately €30,724 (or $39,477). The Company committed to invest up to approximately €38,000 (or $50,000). In January 2015, the Company funded an additional investment of €3,331 (or $3,929) related to its investment in Champ LP. In February 2015, the Company sold approximately 48% of its ownership interest in Champ LP at cost to an account managed by Apollo for approximately €16,314 (or $20,794). In June 2016, the Company transferred €427 of its unfunded commitment to Apollo, reducing its unfunded commitment to Champ LP to €2,802 (or $2,985). In May 2017, the Company sold its remaining ownership interest in Champ LP, to unaffiliated third parties for €21,792 or $24,498, resulting in a loss of $3,305. As of September 30, 2017, the Company had no interest in Champ LP. Loans receivable In June, 2017, the Company increased its outstanding loan commitment through the acquisition of an additional $25,000 of interests in an existing pre-development mezzanine loan from a fund managed by an affiliate of the Manager, increasing the Company's total outstanding loan commitment to $100,000. Furthermore, in September 2017 the Company funded an additional $25,000 to acquire a portion of the same pre-development mezzanine loan from a fund managed by an affiliate of the Manager, increasing the Company's total outstanding loan commitment to $125,000. The pre-development mezzanine loan is for the construction of a residential condominium building in New York, New York and is part of a $300,000 mezzanine loan.

Related Party Transactions

AMTG Merger

As fully described in "Note 17- Business Combination", in August 2016, the Company acquired AMTG, an entity managed by an affiliate of Apollo.

Management Agreement

In connection with the Company’s initial public offering in September 2009, the Company entered into a management agreement (the “Management Agreement”) with the Manager, which describes the services to be provided by the Manager and its compensation for those services. The Manager is responsible for managing the Company’s day-to-day operations, subject to the direction and oversight of the Company’s board of directors.

Pursuant to the terms of the Management Agreement, the Manager is paid a base management fee equal to 1.5% per annum of the Company’s stockholders’ equity (as defined in the Management Agreement), calculated and payable (in cash) quarterly in arrears.

The current term of the Management Agreement expires on September 29, 2018 and is automatically renewed for successive one-year terms on each anniversary thereafter. The Management Agreement may be terminated upon expiration of the one-year extension term only upon the affirmative vote of at least two-thirds of the Company’s independent directors, based upon (1) unsatisfactory performance by the Manager that is materially detrimental to the Company or (2) a determination that the management fee payable to the Manager is not fair, subject to the Manager’s right to prevent such a termination based on unfair fees by accepting a mutually acceptable reduction of management fees agreed to by at least two-thirds of the Company’s independent directors. The Manager must be provided with written notice of any such termination at least 180 days prior to the expiration of the then existing term and will be paid a termination fee equal to three times the sum of the average annual base management fee during the 24-month period immediately preceding the date of termination, calculated as of the end of the most recently completed fiscal quarter prior to the date of termination. Following a meeting by the Company’s independent directors in February 2017, which included a discussion of the Manager’s performance and the level of the management fees thereunder, the Company determined not to seek termination of the Management Agreement.

For the three and nine months ended September 30, 2017, the Company incurred approximately $8,309 and $23,484, respectively, in base management fees under the Management Agreement. For the three and nine months ended September 30, 2016, the Company incurred approximately $5,903 and $16,374, respectively, in base management fees under the Management Agreement. In addition to the base management fee, the Company is also responsible for reimbursing the Manager for certain expenses paid by the Manager on behalf of the Company or for certain services provided by the Manager to the Company. For the three and nine months ended September 30, 2017, the Company paid expenses totaling $37 and $231 respectively, related to reimbursements for certain expenses paid by the Manager on behalf of the Company under the Management Agreement. For the three and nine months ended September 30, 2016, the Company paid expenses totaling $517 and $1,359, respectively, related to reimbursements for certain expenses paid by the Manager on behalf of the Company under the Management Agreement. Expenses incurred by the Manager and reimbursed by the Company are reflected in the respective condensed consolidated statement of operations expense category or the condensed consolidated balance sheet based on the nature of the item.

Included in payable to related party on the condensed consolidated balance sheet at September 30, 2017 and December 31, 2016 are approximately $8,309 and $7,015, respectively, for base management fees incurred but not yet paid under the Management Agreement.

Unconsolidated Joint Venture

In September 2014, the Company, through a wholly owned subsidiary, acquired a 59% ownership interest in Champ LP following which a wholly-owned subsidiary of Champ LP then acquired a 35% ownership interest in BKB. The Company acquired its ownership interest in Champ LP for an initial purchase price paid at closing of approximately €30,724 (or $39,477). The Company committed to invest up to approximately €38,000 (or $50,000).

In January 2015, the Company funded an additional investment of €3,331 (or $3,929) related to its investment in Champ LP. In February 2015, the Company sold approximately 48% of its ownership interest in Champ LP at cost to an account managed by Apollo for approximately €16,314 (or $20,794). In June 2016, the Company transferred €427 of its unfunded commitment to Apollo, reducing its unfunded commitment to Champ LP to €2,802 (or $2,985).

In May 2017, the Company sold its remaining ownership interest in Champ LP, to unaffiliated third parties for €21,792 or $24,498, resulting in a loss of $3,305. As of September 30, 2017, the Company had no interest in Champ LP.

Loans receivable

In June, 2017, the Company increased its outstanding loan commitment through the acquisition of an additional $25,000 of interests in an existing pre-development mezzanine loan from a fund managed by an affiliate of the Manager, increasing the Company's total outstanding loan commitment to $100,000. Furthermore, in September 2017 the Company funded an additional $25,000 to acquire a portion of the same pre-development mezzanine loan from a fund managed by an affiliate of the Manager, increasing the Company's total outstanding loan commitment to $125,000. The pre-development mezzanine loan is for the construction of a residential condominium building in New York, New York and is part of a $300,000 mezzanine loan.