Description of the Business, Basis of Presentation and Recently Adopted Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited consolidated financial statements and accompanying notes have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all information and footnotes required by GAAP for complete financial statements. The interim consolidated balance sheet as of March 31, 2019 and the consolidated statements of operations, the consolidated statements of comprehensive income, the consolidated statements of shareholders' equity, and the consolidated statements of cash flows for the three months ended March 31, 2019 and 2018 are unaudited. The consolidated balance sheet as of December 31, 2018, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures required by GAAP. The unaudited interim financial statements have been prepared on a basis consistent with the Company’s annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments necessary to state fairly the Company’s financial position, results of operations, comprehensive income, equity, and cash flows for the periods presented. The financial data and the other financial information disclosed in the notes to the financial statements related to these periods are also unaudited. The consolidated results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2019 or for any other future annual or interim period. These financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2018 included in the Company’s Annual Report on Form 10-K which was filed with the SEC on February 19, 2019. The unaudited consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Certain changes in presentation have been made to conform the prior period presentation to current period reporting. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and disclosure of contingent assets and liabilities in the financial statements. Such estimates include, but are not limited to, the Company's estimates in connection with leasing equipment, including residual values and depreciable lives, values of assets held for sale and other long lived assets, provision for income tax, allowance for doubtful accounts, share-based compensation, goodwill and intangible assets. Actual results could differ from those estimates.
Concentration of Credit Risk	Concentration of Credit Risk The Company's equipment leases and trade receivables subject it to potential credit risk. The Company extends credit to its customers based upon an evaluation of each customer's financial condition and credit history. Evaluations of the financial condition and associated credit risk of customers are performed on an ongoing basis. The Company's two largest customers CMA CGM S.A. and Mediterranean Shipping Company S.A., accounted for 21% and 14%, respectively, of the Company's lease billings during the three months ended March 31, 2019.
Recently Adopted Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Standards Updates Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) and subsequently issued amendments that replaced existing lease accounting guidance. The accounting standard requires lessees to recognize a lease liability and corresponding right-of-use asset on their balance sheets. The accounting that will be applied by lessors under ASC 842 is largely unchanged from previous GAAP. Certain targeted improvements were made to align, where necessary, lessor accounting with the lessee accounting model and ASC 606, Revenue from Contracts with Customers. The Company adopted the standard on January 1, 2019, through a cumulative-effect adjustment. Additionally, the Company elected the “package of practical expedients,” which provides: (1) An entity need not reassess whether any expired or existing contracts are or contain leases; (2) An entity need not reassess the lease classification for any expired or existing leases; and (3) An entity need not reassess initial direct costs for any existing leases. Furthermore, the Company elected the optional transition method and continued to apply the guidance in ASC 840, including its disclosure requirements, in the comparative prior year periods. At adoption, the Company recognized a lease liability of $10.5 million based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases and corresponding ROU asset of $8.9 million. The Company assessed the requirements from both a lessee and lessor perspective and concluded the adoption of this standard did not have a significant impact on the consolidated financial statements. As a result of this adoption, the Company reclassified $14.8 million of cash collections on finance lease receivables, net of income earned, from investing activities to operating activities on its consolidated statement of cash flows for the three months ended March 31, 2018. Targeted Improvements to Accounting for Hedging Activities. In August 2017, FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815). ASU 2017-12 changes the recognition and presentation requirements of hedge accounting, including: eliminating the requirement to separately measure and report hedge ineffectiveness; and presenting all items that affect earnings in the same income statement line item as the hedged item. The Company adopted the standard on January 1, 2019, and applied the modified retrospective approach. The Company has evaluated the impact of this ASU and concluded the adoption of this standard did not have a significant impact on the consolidated financial statements. Recently Issued Accounting Standards Updates Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326). The guidance affects trade receivables and net investments in leases and requires the measurement of expected credit losses to be based on relevant information from past events, including historical experiences, current conditions and reasonable and supportable forecasts that affect collectability. The new guidance will be effective for fiscal years and interim periods beginning after December 15, 2019 and early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Based on the composition of the Company's receivables, current market conditions and historical credit loss activity, the Company does not expect the adoption of this ASU to have a significant impact on the consolidated financial statements.