Accounting Policies And Recent Accounting Pronouncements (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Depreciation expense	$ 29,873,000	$ 22,655,000	$ 77,401,000	$ 65,907,000
Net income	$ (5,415,000)	$ 13,015,000	$ 5,545,000	$ 39,516,000
Earnings Per Share, Diluted	$ (0.28)	$ 0.62	$ 0.28	$ 1.86
Sales proceeds			$ 46,137,000	$ 51,188,000
20-ft. Standard Dry Van Container [Member]
Residual value	$ 1,050		1,050
40-ft. Standard Dry Van Container [Member]
Residual value	1,300		1,300
40-ft. High Cube Dry Van Container [Member]
Residual value	1,400		1,400		$ 1,650
20-ft. Refrigerated Container [Member]
Residual value	2,750		2,750
40-ft. High Cube Refrigerated Container [Member]
Residual value	3,500		3,500
Reclassification [Member]
Unamortized debt issuance costs	12,700,000		12,700,000			$ 13,000,000
Reclassification [Member] | 40-ft. High Cube Dry Van Container [Member]
Depreciation expense	3,400,000		3,400,000
Net income	$ 3,200,000		$ 3,200,000
Earnings Per Share, Diluted	$ 0.17		$ 0.17
3-year Avg. [Member] | 20-ft. Standard Dry Van Container [Member]
Sales proceeds			$ 989
3-year Avg. [Member] | 40-ft. Standard Dry Van Container [Member]
Sales proceeds			1,229
3-year Avg. [Member] | 40-ft. High Cube Dry Van Container [Member]
Sales proceeds			1,262
3-year Avg. [Member] | 20-ft. Refrigerated Container [Member]
Sales proceeds			3,180
3-year Avg. [Member] | 40-ft. High Cube Refrigerated Container [Member]
Sales proceeds			4,065
5-year Avg. [Member] | 20-ft. Standard Dry Van Container [Member]
Sales proceeds			1,112
5-year Avg. [Member] | 40-ft. Standard Dry Van Container [Member]
Sales proceeds			1,399
5-year Avg. [Member] | 40-ft. High Cube Dry Van Container [Member]
Sales proceeds			1,440
5-year Avg. [Member] | 20-ft. Refrigerated Container [Member]
Sales proceeds			3,219
5-year Avg. [Member] | 40-ft. High Cube Refrigerated Container [Member]
Sales proceeds			$ 4,111