Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recently Issued Accounting Pronouncements In June 2018, the Securities and Exchange Commission issued a final rule, Inline XBRL Filing of Tagged Data, which will require the use of the Inline eXtensible Business Reporting Language (XBRL) format for the submission of operating company financial statement information. In addition, the final rule will eliminate the requirement for operating companies to post “Interactive Data Files” (i.e., machine-readable computer code that presents information in XBRL format) on their websites. Large accelerated filers that prepare their financial statements in accordance with GAAP will be subject to Inline XBRL requirements beginning with the fiscal period ending on or after June 15, 2019. The Company expects to use Inline XBRL starting with its Form 10-Q for the quarter ending June 30, 2019. In February 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02, Leases. This new guidance is effective January 1, 2019, with early adoption permitted. The pronouncement will require lessees to recognize a liability to make lease payments and a right-of-use (ROU) asset, initially measured at the present value of lease payments, for both operating and financing leases. For leases with a term of 12 months or less, lessees will be permitted to make an accounting policy election by class of underlying asset to not recognize lease liabilities and lease assets. The guidance allows lessors to make an accounting policy election, by class of underlying asset, to not separate non-lease components from lease components, if certain requirements are met. The guidance also provides an optional transition method which would allow entities to initially apply the new guidance in the period of adoption, recognizing a cumulative-effect adjustment to the opening balance of retained earnings, if necessary. Upon adoption, the Company will recognize a lease liability and an ROU asset for operating leases where it is the lessee, such as ground leases and office leases. The Company is in the process of evaluating the inputs required to calculate the amounts that will be recorded on its balance sheet for each lease. For leases with a term of 12 months or less, the Company expects to make an accounting policy election by class of underlying asset to not recognize lease liabilities and lease assets. For leases where it is the lessor, the Company expects that accounting for lease components will be largely unchanged from existing GAAP and to elect the practical expedient to not separate non-lease components from lease components. Only incremental direct leasing costs may be capitalized under the new guidance, which is consistent with the Company’s existing policies. The Company expects to adopt this new guidance on January 1, 2019 and apply the requirements as of that date. The Company will continue to evaluate the impact of this guidance until it becomes effective, but the Company does not expect the guidance regarding capitalization of leasing costs will have any effect on its condensed consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses. This new guidance is effective January 1, 2020, with early adoption permitted beginning January 1, 2019, and replaces the current incurred loss impairment methodology with a methodology that reflects expected credit losses. Financial assets that are measured at amortized cost will be required to be presented at the net amount expected to be collected with an allowance for credit losses deducted from the amortized cost basis. In addition, an entity must consider broader information in developing its expected credit loss estimate, including the use of forecasted information. Generally, the pronouncement requires a modified retrospective method of adoption. The Company will continue to evaluate the impact of this guidance until it becomes effective.

Recently Issued Accounting Pronouncements

In June 2018, the Securities and Exchange Commission issued a final rule, Inline XBRL Filing of Tagged Data, which will require the use of the Inline eXtensible Business Reporting Language (XBRL) format for the submission of operating company financial statement information. In addition, the final rule will eliminate the requirement for operating companies to post “Interactive Data Files” (i.e., machine-readable computer code that presents information in XBRL format) on their websites. Large accelerated filers that prepare their financial statements in accordance with GAAP will be subject to Inline XBRL requirements beginning with the fiscal period ending on or after June 15, 2019. The Company expects to use Inline XBRL starting with its Form 10-Q for the quarter ending June 30, 2019.

In February 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02, Leases. This new guidance is effective January 1, 2019, with early adoption permitted. The pronouncement will require lessees to recognize a liability to make lease payments and a right-of-use (ROU) asset, initially measured at the present value of lease payments, for both operating and financing leases. For leases with a term of 12 months or less, lessees will be permitted to make an accounting policy election by class of underlying asset to not recognize lease liabilities and lease assets. The guidance allows lessors to make an accounting policy election, by class of underlying asset, to not separate non-lease components from lease components, if certain requirements are met. The guidance also provides an optional transition method which would allow entities to initially apply the new guidance in the period of adoption, recognizing a cumulative-effect adjustment to the opening balance of retained earnings, if necessary.

Upon adoption, the Company will recognize a lease liability and an ROU asset for operating leases where it is the lessee, such as ground leases and office leases. The Company is in the process of evaluating the inputs required to calculate the amounts that will be recorded on its balance sheet for each lease. For leases with a term of 12 months or less, the Company expects to make an accounting policy election by class of underlying asset to not recognize lease liabilities and lease assets. For leases where it is the lessor, the Company expects that accounting for lease components will be largely unchanged from existing GAAP and to elect the practical expedient to not separate non-lease components from lease components. Only incremental direct leasing costs may be capitalized under the new guidance, which is consistent with the Company’s existing policies. The Company expects to adopt this new guidance on January 1, 2019 and apply the requirements as of that date. The Company will continue to evaluate the impact of this guidance until it becomes effective, but the Company does not expect the guidance regarding capitalization of leasing costs will have any effect on its condensed consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses. This new guidance is effective January 1, 2020, with early adoption permitted beginning January 1, 2019, and replaces the current incurred loss impairment methodology with a methodology that reflects expected credit losses. Financial assets that are measured at amortized cost will be required to be presented at the net amount expected to be collected with an allowance for credit losses deducted from the amortized cost basis. In addition, an entity must consider broader information in developing its expected credit loss estimate, including the use of forecasted information. Generally, the pronouncement requires a modified retrospective method of adoption. The Company will continue to evaluate the impact of this guidance until it becomes effective.