Organization and Basis of Presentation (Policy)	6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance (except revenue in the scope of other accounting standards, including standards related to leasing). Subsequently, the FASB issued the following standards related to ASU 2014-09: ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (“ASU 2016-08”); ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”); and ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”). The Company must adopt ASU 2016-08, ASU 2016-10 and ASU 2016-12 with ASU 2014-09 (collectively, the “New Revenue Standards”) effective January 1, 2018. The New Revenue Standards clarify the required factors that an entity must consider when recognizing revenue and require additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. The New Revenue Standards also provide guidance regarding the measurement of gains and losses relative to the sale of certain nonfinancial assets, including real estate. The Company has created an implementation plan and is progressing in its assessment of the impact of the New Revenue Standards on various revenue streams and evaluating the qualitative and quantitative disclosure guidance. The Company does not expect the New Revenue Standards to have a material impact on the measurement and recognition of gains and losses on the sale of properties. The New Revenue Standards may impact revenue recognized under the percentage of completion method. The Company is currently assessing whether there will an impact on the amount and timing of recognizing its development service fee income which is currently accounted for under the percentage of completion method based on applicable costs incurred and estimated to be incurred. The Company expects the adoption of the New Revenue Standards to have an impact on its business processes, financial reporting disclosures, and internal controls over financial reporting (“ICFR”). The Company plans to adopt the New Revenue Standards using the modified retrospective method. Significant assessment and implementation matters to be addressed prior to adopting the New Revenue Standards include completing a review of customer contracts, determining the impact the new accounting standard will have on the Company’s financial statements and related disclosures, and updating, as needed, the Company’s business processes, systems, and controls required to comply with the New Revenue Standards. Upon completion of the Company’s implementation plan and evaluation of the remaining revenue contracts, the Company will adopt additional controls around ICFR and its business processes for any new and existing revenue arrangements. The Company is on target to complete its assessment of the new revenue standards and the impact on the Company’s financial statements and related disclosures as of January 1, 2018. In February 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for the Company beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. For leases in which the Company is the lessor, the standard requires that the lease and non-lease components of the lease agreement should be separated. Revenue related to the lease component of the contract will be recognized on a straight-line basis, while revenue related to the non-lease component will be recognized under the provisions of ASU 2014-09 (see above). For lease agreements longer than one year in which the Company is the lessee, the Company will measure the present value of the future lease payments and recognize a right-of-use asset and corresponding lease liability on its balance sheet. In addition, the new standard states that only direct leasing costs may be capitalized. The Company is evaluating the impact ASU 2016-02 will have on its financial position and results of operations. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 is designed to clarify how entities should classify cash receipts and cash payments in the statement of cash flows. ASU 2016-15 is effective for the Company beginning January 1, 2018. Early adoption of ASU 2016-15 is permitted. The standard requires retrospective application unless it is impracticable to do so. The Company is evaluating the impact ASU 2016-15 will have on its statement of cash flows. In February 2017, the FASB issued ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets ("ASU 2017-05"). ASU 2017-05 is designed to provide guidance on how to recognize gain and losses on sales, including partial sale, of nonfinancial assets to noncustomers. ASU 2017-05 is effective for the Company beginning January 1, 2018. Early adoption is permitted but the standard is required to be adopted concurrently with ASU 2014-09. The Company is evaluating the impact ASU 2017-05 will have on the Company's financial position and results of operations. In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. ASU 2017-09 is effective for the Company beginning January 1, 2018. Early adoption is permitted. The new guidance will be applied prospectively to awards modified on or after the adoption date. The Company is evaluating the impact ASU 2017-09 will have on the Company's financial position and results of operations.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), which supersedes nearly all existing revenue recognition guidance (except revenue in the scope of other accounting standards, including standards related to leasing). Subsequently, the FASB issued the following standards related to ASU 2014-09: ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (“ASU 2016-08”); ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”); and ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”). The Company must adopt ASU 2016-08, ASU 2016-10 and ASU 2016-12 with ASU 2014-09 (collectively, the “New Revenue Standards”) effective January 1, 2018. The New Revenue Standards clarify the required factors that an entity must consider when recognizing revenue and require additional disclosures concerning contracts with customers, judgments concerning revenue recognition, and assets recognized for the costs to obtain or fulfill a contract. The New Revenue Standards also provide guidance regarding the measurement of gains and losses relative to the sale of certain nonfinancial assets, including real estate. The Company has created an implementation plan and is progressing in its assessment of the impact of the New Revenue Standards on various revenue streams and evaluating the qualitative and quantitative disclosure guidance. The Company does not expect the New Revenue Standards to have a material impact on the measurement and recognition of gains and losses on the sale of properties. The New Revenue Standards may impact revenue recognized under the percentage of completion method. The Company is currently assessing whether there will an impact on the amount and timing of recognizing its development service fee income which is currently accounted for under the percentage of completion method based on applicable costs incurred and estimated to be incurred. The Company expects the adoption of the New Revenue Standards to have an impact on its business processes, financial reporting disclosures, and internal controls over financial reporting (“ICFR”). The Company plans to adopt the New Revenue Standards using the modified retrospective method. Significant assessment and implementation matters to be addressed prior to adopting the New Revenue Standards include completing a review of customer contracts, determining the impact the new accounting standard will have on the Company’s financial statements and related disclosures, and updating, as needed, the Company’s business processes, systems, and controls required to comply with the New Revenue Standards. Upon completion of the Company’s implementation plan and evaluation of the remaining revenue contracts, the Company will adopt additional controls around ICFR and its business processes for any new and existing revenue arrangements. The Company is on target to complete its assessment of the new revenue standards and the impact on the Company’s financial statements and related disclosures as of January 1, 2018.

In February 2016, the FASB issued ASU 2016-02, Leases ("ASU 2016-02"). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for the Company beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. For leases in which the Company is the lessor, the standard requires that the lease and non-lease components of the lease agreement should be separated. Revenue related to the lease component of the contract will be recognized on a straight-line basis, while revenue related to the non-lease component will be recognized under the provisions of ASU 2014-09 (see above). For lease agreements longer than one year in which the Company is the lessee, the Company will measure the present value of the future lease payments and recognize a right-of-use asset and corresponding lease liability on its balance sheet. In addition, the new standard states that only direct leasing costs may be capitalized. The Company is evaluating the impact ASU 2016-02 will have on its financial position and results of operations.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 is designed to clarify how entities should classify cash receipts and cash payments in the statement of cash flows. ASU 2016-15 is effective for the Company beginning January 1, 2018. Early adoption of ASU 2016-15 is permitted. The standard requires retrospective application unless it is impracticable to do so. The Company is evaluating the impact ASU 2016-15 will have on its statement of cash flows.

In February 2017, the FASB issued ASU 2017-05, Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets ("ASU 2017-05"). ASU 2017-05 is designed to provide guidance on how to recognize gain and losses on sales, including partial sale, of nonfinancial assets to noncustomers. ASU 2017-05 is effective for the Company beginning January 1, 2018. Early adoption is permitted but the standard is required to be adopted concurrently with ASU 2014-09. The Company is evaluating the impact ASU 2017-05 will have on the Company's financial position and results of operations.

In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 clarifies when changes to the terms or conditions of a share-based payment award must be accounted for as modifications. ASU 2017-09 is effective for the Company beginning January 1, 2018. Early adoption is permitted. The new guidance will be applied prospectively to awards modified on or after the adoption date. The Company is evaluating the impact ASU 2017-09 will have on the Company's financial position and results of operations.