Accounting Policies And Recent Accounting Pronouncements (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Significant Accounting Policies [Line Items]
Depreciation expense	$ 27,972,000	$ 23,034,000
Net income	$ 5,272,000	$ 7,151,000
Earnings Per Share, Diluted	$ 0.27	$ 0.36
Deferred tax asset	$ 1,000,000
40-ft. High Cube Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Residual value	1,400		$ 1,650
Reclassification [Member] | 40-ft. High Cube Dry Van Container [Member]
Significant Accounting Policies [Line Items]
Depreciation expense	2,300,000
Net income	$ 2,200,000
Earnings Per Share, Diluted	$ 0.11