Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)		3 Months Ended																12 Months Ended
		Dec. 31, 2016		Sep. 30, 2016	[3]	Jun. 30, 2016	[3]	Mar. 31, 2016	[3]	Dec. 31, 2015		Sep. 30, 2015	[3]	Jun. 30, 2015	[3]	Mar. 31, 2015	[3]	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Significant Accounting Policies [Line Items]
Depreciation expense	[1]																	$ 104,877,000	$ 113,590,000		$ 77,976,000	[2]
Net income																		$ 6,034,000	$ 26,735,000	[1]	$ 59,998,000	[1]
Earnings Per Share, Diluted		$ 0.03	[3]	$ (0.29)		$ 0.20		$ 0.37		$ (0.63)	[3]	$ 0.61		$ 0.60		$ 0.63		$ 0.31	$ 1.27	[1]	$ 2.83	[1]
Sales proceeds																		$ 66,073,000	$ 66,150,000	[1]	$ 65,637,000	[1]
Impairment charges																		24,500,000	0		0
Goodwill	[1]	$ 15,794,000								$ 2,905,000	[4]							15,794,000	2,905,000	[4]
Impairment of goodwill																		$ 0
Percentage of general reserve on receivables one to thirty days overdue																		1.00%
Percentage of reserve on receivables one year overdue																		100.00%
Maximum period for general reserve with specific maximum percentage																		1 year
Accounts receivable		63,745,000								55,284,000	[4]							$ 63,745,000	55,284,000	[4]
Debt [Member]
Significant Accounting Policies [Line Items]
Correcting entries, Balance Sheet										1,200,000									1,200,000
Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Correcting entries, Balance Sheet										(1,200,000)									(1,200,000)
Furniture And Fixtures [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		5 years
Residual value		0																$ 0
20-ft. Standard Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		13 years
Residual value		1,050																$ 1,050
40-ft. Standard Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		13 years
Residual value		1,300																$ 1,300
40-ft. High Cube Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		13 years
Residual value		1,400																$ 1,400
20-ft. Refrigerated Container [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		12 years
Residual value		2,750																$ 2,750
40-ft. High Cube Refrigerated Container [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		12 years
Residual value		3,500																$ 3,500
Railcars [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		43 years
Residual value		8,700																$ 8,700
Interest Expense [Member]
Significant Accounting Policies [Line Items]
Correcting entries, Statements of Income																			200,000		400,000
Net Income [Member]
Significant Accounting Policies [Line Items]
Correcting entries, Statements of Income																			(200,000)		(400,000)
Managed Fleet [Member]
Significant Accounting Policies [Line Items]
Accounts receivable		5,100,000								4,500,000								5,100,000	4,500,000
Reclassification [Member]
Significant Accounting Policies [Line Items]
Unamortized bebt issuance cost		11,200,000								$ 11,800,000								11,200,000	11,800,000
Reclassification [Member] | 40-ft. High Cube Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Depreciation expense																		5,400,000
Net income																		$ 5,200,000
Earnings Per Share, Diluted																		$ 0.27
3-year Avg. [Member] | 20-ft. Standard Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		$ 957,000
3-year Avg. [Member] | 40-ft. Standard Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		1,172,000
3-year Avg. [Member] | 40-ft. High Cube Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		1,189,000
3-year Avg. [Member] | 20-ft. Refrigerated Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		3,180
3-year Avg. [Member] | 40-ft. High Cube Refrigerated Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		4,052
5-year Avg. [Member] | 20-ft. Standard Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		1,076,000
5-year Avg. [Member] | 40-ft. Standard Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		1,332,000
5-year Avg. [Member] | 40-ft. High Cube Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		1,346,000
5-year Avg. [Member] | 20-ft. Refrigerated Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		3,219
5-year Avg. [Member] | 40-ft. High Cube Refrigerated Container [Member]
Significant Accounting Policies [Line Items]
Sales proceeds																		$ 4,098
Minimum [Member]
Significant Accounting Policies [Line Items]
Period for general reserve with specific minimum percentage																		1 day
Minimum [Member] | Other Specialized Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		12 years 6 months
Residual value		1,000																$ 1,000
Minimum [Member] | Railcars [Member]
Significant Accounting Policies [Line Items]
Capitalized cost threshold																		$ 5,000
Maximum [Member]
Significant Accounting Policies [Line Items]
Period for general reserve with specific minimum percentage																		30 days
Maximum [Member] | Other Specialized Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful life																		15 years
Residual value		$ 3,500																$ 3,500
Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Correcting entries, Statements of Stockholders' Equity																					(900,000)		$ (500,000)
Net income	[1]																	$ 5,997,000	$ 26,601,000		$ 59,887,000

[1] Amounts for the years ended December 31, 2015 and 2014 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").

[2] At the inception of the lease, the Company records the total minimum lease payments, executory costs, if any, and unguaranteed residual value as gross finance lease receivables. The gross finance lease receivables are reduced as customer payments are received. There was $2.1 million and no unguaranteed residual value, respectively, at December 31, 2016 and 2015, included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of December 31, 2016 and 2015.

[3] Amounts for the quarters ended March 31, 2016 and 2015, June 30, 2016 and 2015, September 30, 2016 and 2015, and December 31, 2015 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors")

[4] Amounts for the year ended December 31, 2015 have been restated for immaterial corrections of identified errors relating to prepaid loan fees (see Note 2 (b) "Correction of Immaterial Errors").