Summary of Significant Accounting Policies | Summary of Significant Accounting Policies The summary of significant accounting policies presented below is designed to assist in understanding the Company’s condensed consolidated financial statements. Such condensed consolidated financial statements and the accompanying notes thereto are the representation of management. The accompanying condensed consolidated unaudited financial statements of the Company have been prepared in accordance with the accounting principles generally accepted in the United States, or GAAP, for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal and recurring nature considered necessary for a fair presentation have been included. Operating results for the three and nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for the year ended December 31, 2016 . The condensed consolidated balance sheet at December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by GAAP for complete financial statements. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements as of and for the year ended December 31, 2015 and related notes thereto set forth in the Company’s Annual Report on Form 10-K, filed with the SEC on March 28, 2016. Principles of Consolidation and Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of the Company, the Operating Partnership, all majority-owned subsidiaries and controlled subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. On January 1, 2016, the Company adopted Accounting Standards Update, or ASU, ASU 2015-02, Amendments to the Consolidation Analysis, which amends the current consolidation guidance affecting both the variable interest entity, or VIE, and voting interest entity, or VOE, consolidation models. The standard does not add or remove any of the characteristics in determining if an entity is a VIE or VOE, but rather enhances the way the Company assesses some of these characteristics. The Company concluded that no change was required to its accounting for its joint venture. However, the Operating Partnership now meets the criteria as a VIE, the Company is the primary beneficiary and, accordingly, the Company continues to consolidate the Operating Partnership. The Company’s sole asset is its investment in the Operating Partnership, and consequently, all of the Company’s assets and liabilities represent those assets and liabilities of the Operating Partnership. All of the Company’s debt is an obligation of the Operating Partnership. Use of Estimates The preparation of the condensed consolidated financial statements in conformity with GAAP necessarily requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates are made and evaluated on an ongoing basis using information that is currently available as well as various other assumptions believed to be reasonable under the circumstances. Actual results could differ from those estimates. Impairment of Long Lived Assets The Company continually monitors events and changes in circumstances that could indicate that the carrying amounts of its real estate and related intangible assets may not be recoverable. When indicators of potential impairment suggest that the carrying value of real estate and related intangible assets may not be recoverable, the Company assesses the recoverability of the assets by estimating whether the Company will recover the carrying value of the assets through the undiscounted future cash flows and eventual disposition. If based on this analysis the Company does not believe that it will be able to recover the carrying value of the assets, the Company will record an impairment loss to the extent that the carrying value exceeds the estimated fair value of the assets. The Company has not recognized impairment losses related to real estate. During the three and nine months ended September 30, 2016, the Company accelerated the amortization of one in-place lease intangible asset in the amount of $14,634,000 as a result of one tenant experiencing financial difficulties which the Company believes will result in new lease terms. During the three and nine months ended September 30, 2015, the Company accelerated the amortization of one in-place lease intangible asset in the amount of $3,121,000 as a result of one lease termination. These amounts are included as a component of depreciation and amortization expense in the accompanying condensed consolidated statements of comprehensive income (loss) . Allowance for Uncollectible Accounts Tenant receivables and unbilled deferred rent receivables are carried net of the allowances for uncollectible amounts. An allowance will be maintained for estimated losses resulting from the inability of certain tenants to meet the contractual obligations under their lease agreements. The Company also maintains an allowance for deferred rent receivables arising from the straight-lining of rents. The Company’s determination of the adequacy of these allowances is based primarily upon evaluations of historical loss experience, the tenant’s financial condition, security deposits, letters of credit, lease guarantees and current economic conditions and other relevant factors. For the three and nine months ended September 30, 2016 , the Company recorded $990,000 and $1,799,000 , respectively, in bad debt expense related to reserves for rental and parking revenue and tenant reimbursement revenue, which are recognized in the accompanying condensed consolidated statements of comprehensive income (loss) as a deduction from rental and parking revenue and tenant reimbursement revenue. In addition, for the three and nine months ended September 30, 2016, the Company wrote off $14,366,000 related to straight-line rent receivable and $1,146,000 related to a lease incentive asset, which are recognized in the accompanying condensed consolidated statements of comprehensive income (loss) as a deduction from rental and parking revenue. The bad debt expense and write offs of straight-line rent receivable and the lease incentive asset are the result of one tenant experiencing financial difficulties which the Company believes will result in new lease terms. For the three and nine months ended September 30, 2015, the Company recorded $3,376,000 in bad debt expense. Notes Receivable Notes receivable are reported at their outstanding principal balance, net of any unearned income, unamortized deferred fees and costs and allowances for doubtful accounts. The Company evaluates the collectability of both interest and principal on each note receivable to determine whether it is collectible, primarily through the evaluation of the credit quality indicators, such as the tenant's financial condition, evaluations of historical loss experience, current economic conditions and other relevant factors. Impairment occurs when it is determined probable that the Company will not be able to collect principal and interest amounts due according to the contractual terms of the note. As of September 30, 2016 and December 31, 2015 , the aggregate balance on the Company’s notes receivable was $17,327,000 and $13,000,000 , respectively. For the three and nine months ended September 30, 2016 , the Company recorded $0 and $1,625,000 , respectively, as an allowance to reduce the carrying value of a note receivable and $42,000 and $83,000 , respectively, recorded as a corresponding reserve related to accrued interest in provision for loan losses in the accompanying condensed consolidated financial statements. Concentration of Credit Risk and Significant Leases As of September 30, 2016 , the Company had cash on deposit, including restricted cash, in certain financial institutions that had deposits in excess of current federally insured levels; however, the Company has not experienced any losses in such accounts. The Company limits its cash investments to financial institutions with high credit standings; therefore, the Company believes it is not exposed to any significant credit risk on its cash deposits. To date, the Company has experienced no loss of or lack of access to cash in its accounts. Concentration of credit risk with respect to accounts receivable from tenants is limited. As of September 30, 2016 , the Company owned real estate investments in 46 MSAs, (including one real estate investment owned through a consolidated partnership), three of which accounted for 10.0% or more of contractual rental revenue. Real estate investments located in the Dallas-Ft. Worth-Arlington, Texas MSA, the Chicago-Naperville-Elgin, Illinois-Indiana-Wisconsin MSA and the Houston-The Woodlands-Sugar Land, Texas MSA accounted for an aggregate of 12.9% , 11.3% and 10.0% , respectively, of contractual rental revenue for the nine months ended September 30, 2016 . As of September 30, 2016 , the Company had two exposures to tenant concentration that accounted for 10.0% or more of contractual rental revenu e. The leases w ith AT&T Services, Inc. and the lease with Bay Area Regional Medical Center, LLC accounted for 12.2% and 10.0% , respectively, of contractual rental revenue for the nine months ended September 30, 2016 . Deferred Financing Costs Deferred financing costs are loan fees, legal fees and other third-party costs associated with obtaining financing. These costs are amortized over the terms of the respective financing agreements using the effective interest method. Unamortized deferred financing costs are generally expensed when the associated debt is refinanced or repaid before maturity unless specific rules are met that would allow for the carryover of such costs to the refinanced debt. Costs incurred in seeking financing transactions that do not close are expensed in the period in which it is determined that the financing will not close. On January 1, 2016, the Company adopted ASU 2015-03, Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, and ASU 2015-15, Interest—Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated With Line-of-Credit Arrangements, or ASUs 2015-03 and 2015-15. According to ASUs 2015-03 and 2015-15, deferred financing costs related to a recognized debt liability in connection with term loans, including the term loan portion of the Company's credit facility, are presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. Deferred financing costs related to the revolving line of credit portion of the Company's unsecured credit facility are presented in the balance sheet as an asset, which is included in other assets on the condensed consolidated balance sheet. As required, the Company retrospectively applied the guidance in ASUs 2015-03 and 2015-15 to the prior period presented, which resulted in a decrease of $6,805,000 in other assets, $4,261,000 in notes payable and $2,544,000 in credit facility on the condensed consolidated balance sheet as of December 31, 2015. Share Repurchase Program The Company’s share repurchase program allows for repurchases of shares of the Company’s common stock when certain criteria are met. The share repurchase program provides that all repurchases during any calendar year, including those redeemable upon death or a qualifying disability of a stockholder, are limited to those that can be funded with equivalent reinvestments pursuant to the DRIP offerings during the prior calendar year and other operating funds, if any, as the board of directors, in its sole discretion, may reserve for this purpose. Repurchases of shares of the Company’s common stock are at the sole discretion of the Company’s board of directors. In addition, the Company’s board of directors, in its sole discretion, may amend, suspend, reduce, terminate or otherwise change the share repurchase program upon 30 days ' prior notice to the Company’s stockholders for any reason it deems appropriate. The share repurchase program provides that the Company will limit the number of shares repurchased during any calendar year to 5.0% of the number of shares of common stock outstanding as of December 31 st of the previous calendar year. During the nine months ended September 30, 2016 , the Company received valid repurchase requests related to approximately 2,696,000 shares of common stock, all of which were repurchased in full for an aggregate purchase price of approximately $26,146,000 (an average of $9.70 per share). During the nine months ended September 30, 2015 , the Company received valid repurchase requests related to approximately 577,000 shares of common stock, all of which were repurchased in full for an aggregate purchase price of approximately $5,521,000 (an average of $9.57 per share). Earnings Per Share Basic earnings per share attributable to common stockholders for all periods presented are computed by dividing net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Shares of non-vested restricted common stock give rise to potentially dilutive shares of common stock. Diluted earnings per share are computed based on the weighted average number of shares outstanding and all potentially dilutive securities. For the three months ended September 30, 2016 , there were approximately 17,000 shares of non-vested restricted common stock outstanding; however, such shares were excluded from the computation of diluted earnings per share because such shares were anti-dilutive during this period. For the three months ended September 30, 2015 , diluted earnings per share reflected the effect of approximately 17,000 non-vested shares of restricted common stock that were outstanding as of such period. For the nine months ended September 30, 2016 and 2015 , diluted earnings per share reflected the effect of approximately 19,000 non-vested shares of restricted common stock that were outstanding as of such periods. Recently Issued Accounting Pronouncements On May 28, 2014, the Financial Accounting Standards Board, or the FASB, issued ASU 2014-09, Revenue from Contracts with Customers , or ASU 2014-09. The objective of ASU 2014-09 is to clarify the principles for recognizing revenue and to develop a common revenue standard for GAAP. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods and services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 defines a five-step process to achieve this core principle, which may require more judgment and estimates within the revenue recognition process than are required under existing GAAP. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606) Deferral of the Effective Date , or ASU 2015-14. ASU 2015-14 defers the effective date of ASU 2014-09 by one year to fiscal years and interim periods beginning after December 15, 2017. Early adoption is permitted as of the original effective date, which was annual reporting periods beginning after December 15, 2016, and the interim periods within that year. On March 17, 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers Principal versus Agent Considerations (Reporting Revenue Gross versus Net), or ASU 2016-08, which clarifies the implementation guidance on principal versus agent considerations in the new revenue recognition standard. ASU 2016-08 clarifies that an entity is a principal when it controls the specified good or service before that good or service is transferred to the customer, and is an agent when it does not control the specified good or service before it is transferred to the customer. The effective date and transition of this update is the same as the effective date and transition of ASU 2015-14. The Company is in the process of evaluating the impact ASUs 2014-09 and 2016-08 will have on the Company’s condensed consolidated financial statements. On June 16, 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses, or ASU 2016-13. ASU 2016-13 requires more timely recording of credit losses on loans and other financial instruments that are not accounted for at fair value through net income, including loans held for investment, held-to-maturity debt securities, trade and other receivables, net investment in leases and other such commitments. ASU 2016-13 requires that financial assets measured at amortized cost be presented at the net amount expected to be collected, through an allowance for credit losses that is deducted from the amortized cost basis. The amendments in ASU 2016-13 require the Company to measure all expected credit losses based upon historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the financial assets and eliminates the “incurred loss” methodology in current GAAP. ASU 2016-13 is effective for fiscal years, and interim periods within, beginning after December 15, 2019. Early adoption is permitted for fiscal years, and interim periods within, beginning after December 15, 2018. The Company is in the process of evaluating the impact ASU 2016-13 will have on the Company’s condensed consolidated financial statements. On August 26, 2016, the FASB issued ASU 2016-15, Statement of Cash Flows , or ASU 2016-15. ASU 2016-15 is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. ASU 2016-15 addresses eight classification issues related to the statement of cash flows: 1) debt prepayment or debt extinguishment costs; 2) settlement of zero-coupon bonds; 3) contingent consideration payments made after a business combination; 4) proceeds from the settlement of insurance claims; 5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; 6) distributions received from equity method investees; 7) beneficial interests in securitization transactions; and 8) separately identifiable cash flows and application of the predominance principle. ASU 2016-15 is effective for public business entities for annual and interim periods in fiscal years beginning after December 15, 2017. Entities should apply this ASU using a retrospective transition method to each period presented. The Company is in the process of evaluating the impact ASU 2016-15 will have on the Company’s condensed consolidated financial statements. Reclassifications Certain prior period amounts have been reclassified to conform to the current financial statement presentation, with no effect on the Company’s condensed consolidated financial position or results of operations. |