Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies On January 1, 2017, the Company adopted Accounting Standards Update ("ASU") 2016-09, Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which was issued to simplify several aspects of the accounting for share-based payment transactions, including income tax, classification of awards as either equity or liabilities and classification on the statement of cash flows. The adoption of ASU 2016-09 did not have a material impact on the Company's consolidated financial statements. As of September 30, 2017, the remainder of the Company's significant accounting policies, which are detailed in the Company's 2016 Annual Report, have not changed materially. New Accounting Pronouncements—In August 2017, the FASB issued Accounting Standards Update ("ASU") 2017-12, Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"), to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 expands and refines hedge accounting for both nonfinancial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. ASU 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements. In February 2017, the FASB issued ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets ("ASU 2017-05"), to clarify the scope of Subtopic 610-20, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets, and to add guidance for partial sales of nonfinancial assets. The amendments in ASU 2017-05 simplify GAAP by eliminating several accounting differences between transactions involving assets and transactions involving businesses. The amendments in ASU 2017-05 require an entity to initially measure a retained noncontrolling interest in a nonfinancial asset at fair value consistent with how a retained noncontrolling interest in a business is measured. Also, if an entity transfers ownership interests in a consolidated subsidiary that is within the scope of ASC 610-20 and continues to have a controlling financial interest in that subsidiary, ASU 2017-05 requires the entity to account for the transaction as an equity transaction, which is consistent with how changes in ownership interests in a consolidated subsidiary that is a business are recorded when a parent retains a controlling financial interest in the business. ASU 2017-05 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted beginning January 1, 2017. Management is evaluating the impact of the guidance on the Company's consolidated financial statements and expects to adopt the retrospective approach, which would require the Company to recast revenue and expenses for all prior periods presented in the year of adoption of the new standard. The Company expects that transactions in assets and businesses in which the Company retains an ownership interest, such as the sale of a controlling interest in its GL business (refer to Note 4), will be impacted by this guidance. As a result, under the retrospective approach, in 2018, the Company expects to record an incremental gain of $55.5 million in its consolidated statements of operations for the nine months ended September 30, 2017, bringing the Company's full gain on the sale of its GL business to approximately $178.9 million. In January 2017, the FASB issued ASU 2017-01, Business Combinations: Clarifying the Definition of a Business ("ASU 2017-01"), to provide a more robust framework to use in determining when a set of assets and activities is a business. The amendments provide more consistency in applying the guidance, reduce the costs of application, and make the definition of a business more operable. The Company's real estate acquisitions have historically been accounted for as a business combination or an asset acquisition. Under ASU 2017-01, certain transactions previously accounted for as business combinations under the existing guidance would be accounted for as asset acquisitions under the new guidance. As a result, the Company expects more transaction costs to be capitalized under real estate acquisitions and less transaction costs to be expensed under business combinations. ASU 2017-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early application is permitted. Management is evaluating the impact of the guidance on the Company's consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash ("ASU 2016-18"), which requires that restricted cash be included with cash and cash equivalents when reconciling beginning and ending cash and cash equivalents on the statement of cash flows. In addition, ASU 2016-18 requires disclosure of what is included in restricted cash. ASU 2016-18 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which was issued to reduce diversity in practice in how certain cash receipts and cash payments, including debt prepayment or debt extinguishment costs, distributions from equity method investees, and other separately identifiable cash flows, are presented and classified in the statement of cash flows. ASU 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"), which was issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments held by a reporting entity. This amendment replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The Company currently records a general reserve that covers performing loans and reserves for loan losses are recorded when (i) available information as of each balance sheet date indicates that it is probable a loss has occurred in the portfolio and (ii) the amount of the loss can be reasonably estimated. The formula-based general reserve is derived from estimated principal default probabilities and loss severities applied to groups of loans based upon risk ratings assigned to loans with similar risk characteristics during our quarterly loan portfolio assessment. The Company estimates loss rates based on historical realized losses experienced within its portfolio and take into account current economic conditions affecting the commercial real estate market when establishing appropriate time frames to evaluate loss experience. The Company believes this general reserve component of its total loan loss reserves should minimize the impact of ASU 2016-13. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"), which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases. For operating leases, a lessee will be required to do the following: (i) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; (ii) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis and (iii) classify all cash payments within operating activities in the statement of cash flows. For operating lease arrangements for which the Company is the lessee, primarily the lease of office space, the Company expects the impact of ASU 2016-02 to be the recognition of a right-of-use asset and lease liability on its consolidated balance sheets. The accounting applied by the Company as a lessor will be largely unchanged from that applied under previous GAAP. However, in certain instances, a new long-term lease of land subsequent to adoption could be classified as a sales-type lease, which could result in the Company derecognizing the underlying asset from its books and recording a profit or loss on sale and the net investment in the lease. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. Management is evaluating the impact of the guidance on the Company's consolidated financial statements. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is not permitted. Management is evaluating the impact of the guidance on the Company's consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which supersedes existing industry-specific guidance, including ASC 360-20, Real Estate Sales. The new standard is principles-based and requires more estimates and judgment than current guidance. Certain contracts with customers, including lease contracts and financial instruments and other contractual rights, are not within the scope of the new guidance. Although most of the Company's revenue is operating lease income generated from lease contracts and interest income generated from financial instruments, certain other of the Company's revenue streams will be impacted by the new guidance. The Company currently expects that income from the sale of residential condominiums, land development revenue and other income will be impacted by ASU 2014-09. The Company does not expect income from the sales of net lease or commercial operating properties to be impacted by ASU 2014-09. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date, to defer the effective date of ASU 2014-09 by one year. ASU 2014-09 is now effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted beginning January 1, 2017. Management is evaluating the impact of the guidance on the Company’s consolidated financial statements and expects to adopt the full retrospective approach, which would require the Company to recast revenue and expenses for all prior periods presented in the year of adoption of the new standard.

Summary of Significant Accounting Policies

On January 1, 2017, the Company adopted Accounting Standards Update ("ASU") 2016-09, Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which was issued to simplify several aspects of the accounting for share-based payment transactions, including income tax, classification of awards as either equity or liabilities and classification on the statement of cash flows. The adoption of ASU 2016-09 did not have a material impact on the Company's consolidated financial statements.

As of September 30, 2017, the remainder of the Company's significant accounting policies, which are detailed in the Company's 2016 Annual Report, have not changed materially.

New Accounting Pronouncements—In August 2017, the FASB issued Accounting Standards Update ("ASU") 2017-12, Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"), to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU 2017-12 expands and refines hedge accounting for both nonfinancial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. ASU 2017-12 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements.

In February 2017, the FASB issued ASU 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets ("ASU 2017-05"), to clarify the scope of Subtopic 610-20, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets, and to add guidance for partial sales of nonfinancial assets. The amendments in ASU 2017-05 simplify GAAP by eliminating several accounting differences between transactions involving assets and transactions involving businesses. The amendments in ASU 2017-05 require an entity to initially measure a retained noncontrolling interest in a nonfinancial asset at fair value consistent with how a retained noncontrolling interest in a business is measured. Also, if an entity transfers ownership interests in a consolidated subsidiary that is within the scope of ASC 610-20 and continues to have a controlling financial interest in that subsidiary, ASU 2017-05 requires the entity to account for the transaction as an equity transaction, which is consistent with how changes in ownership interests in a consolidated subsidiary that is a business are recorded when a parent retains a controlling financial interest in the business. ASU 2017-05 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted beginning January 1, 2017. Management is evaluating the impact of the guidance on the Company's consolidated financial statements and expects to adopt the retrospective approach, which would require the Company to recast revenue and expenses for all prior periods presented in the year of adoption of the new standard. The Company expects that transactions in assets and businesses in which the Company retains an ownership interest, such as the sale of a controlling interest in its GL business (refer to Note 4), will be impacted by this guidance. As a result, under the retrospective approach, in 2018, the Company expects to record an incremental gain of $55.5 million in its consolidated statements of operations for the nine months ended September 30, 2017, bringing the Company's full gain on the sale of its GL business to approximately $178.9 million.

In January 2017, the FASB issued ASU 2017-01, Business Combinations: Clarifying the Definition of a Business ("ASU 2017-01"), to provide a more robust framework to use in determining when a set of assets and activities is a business. The amendments provide more consistency in applying the guidance, reduce the costs of application, and make the definition of a business more operable. The Company's real estate acquisitions have historically been accounted for as a business combination or an asset acquisition. Under ASU 2017-01, certain transactions previously accounted for as business combinations under the existing guidance would be accounted for as asset acquisitions under the new guidance. As a result, the Company expects more transaction costs to be capitalized under real estate acquisitions and less transaction costs to be expensed under business combinations. ASU 2017-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early application is permitted. Management is evaluating the impact of the guidance on the Company's consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows: Restricted Cash ("ASU 2016-18"), which requires that restricted cash be included with cash and cash equivalents when reconciling beginning and ending cash and cash equivalents on the statement of cash flows. In addition, ASU 2016-18 requires disclosure of what is included in restricted cash. ASU 2016-18 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which was issued to reduce diversity in practice in how certain cash receipts and cash payments, including debt prepayment or debt extinguishment costs, distributions from equity method investees, and other separately identifiable cash flows, are presented and classified in the statement of cash flows. ASU 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"), which was issued to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments held by a reporting entity. This amendment replaces the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The Company currently records a general reserve that covers performing loans and reserves for loan losses are recorded when (i) available information as of each balance sheet date indicates that it is probable a loss has occurred in the portfolio and (ii) the amount of the loss can be reasonably estimated. The formula-based general reserve is derived from estimated principal default probabilities and loss severities applied to groups of loans based upon risk ratings assigned to loans with similar risk characteristics during our quarterly loan portfolio assessment. The Company estimates loss rates based on historical realized losses experienced within its portfolio and take into account current economic conditions affecting the commercial real estate market when establishing appropriate time frames to evaluate loss experience. The Company believes this general reserve component of its total loan loss reserves should minimize the impact of ASU 2016-13. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted for interim and annual reporting periods beginning after December 15, 2018. Management does not believe the guidance will have a material impact on the Company's consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"), which requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases. For operating leases, a lessee will be required to do the following: (i) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; (ii) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis and (iii) classify all cash payments within operating activities in the statement of cash flows. For operating lease arrangements for which the Company is the lessee, primarily the lease of office space, the Company expects the impact of ASU 2016-02 to be the recognition of a right-of-use asset and lease liability on its consolidated balance sheets. The accounting applied by the Company as a lessor will be largely unchanged from that applied under previous GAAP. However, in certain instances, a new long-term lease of land subsequent to adoption could be classified as a sales-type lease, which could result in the Company derecognizing the underlying asset from its books and recording a profit or loss on sale and the net investment in the lease. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. Management is evaluating the impact of the guidance on the Company's consolidated financial statements.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is not permitted. Management is evaluating the impact of the guidance on the Company's consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which supersedes existing industry-specific guidance, including ASC 360-20, Real Estate Sales. The new standard is principles-based and requires more estimates and judgment than current guidance. Certain contracts with customers, including lease contracts and financial instruments and other contractual rights, are not within the scope of the new guidance. Although most of the Company's revenue is operating lease income generated from lease contracts and interest income generated from financial instruments, certain other of the Company's revenue streams will be impacted by the new guidance. The Company currently expects that income from the sale of residential condominiums, land development revenue and other income will be impacted by ASU 2014-09. The Company does not expect income from the sales of net lease or commercial operating properties to be impacted by ASU 2014-09. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers - Deferral of the Effective Date, to defer the effective date of ASU 2014-09 by one year. ASU 2014-09 is now effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted beginning January 1, 2017. Management is evaluating the impact of the guidance on the Company’s consolidated financial statements and expects to adopt the full retrospective approach, which would require the Company to recast revenue and expenses for all prior periods presented in the year of adoption of the new standard.