Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net earnings	$ 21,467	$ 42,688
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	28,174	25,616
Amortization of deferred costs	250	252
(Gain) loss on disposal of property, plant, equipment and leased railcars	(12)	18
Earnings from joint ventures	(1,346)	(2,944)
Provision for deferred income taxes	26,720	15,163
Items related to investing activities:
Available-for-sale Securities, Gross Realized Gains	(1,823)	0
Changes in operating assets and liabilities:
Accounts receivable, net	(393)	(11,421)
Accounts receivable, due from related parties	2,357	3,322
Income taxes receivable	(12,248)	926
Inventories, net	4,264	20,167
Prepaid expenses and other current assets	235	(2,643)
Accounts payable	(4,983)	(11,377)
Accounts payable, due to related parties	(3,065)	(2,569)
Accrued expenses and taxes	(8,401)	8,514
Other	956	1,772
Net cash provided by operating activities	52,152	87,484
Investing activities:
Purchases of property, plant and equipment	(3,422)	(11,187)
Grant Proceeds	0	75
Capital expenditures - leased railcars	(103,765)	(33,444)
Proceeds from sale of property, plant, and equipment and leased railcars	73	640
Proceeds from Sale of Available-for-sale Securities	4,086	0
Proceeds from repayments of loans by joint ventures	2,953	2,953
Net cash used in investing activities	(100,075)	(40,963)
Financing activities:
Repayments of debt	(12,669)	(112,834)
Change in restricted cash related to long-term debt	30	263
Stock repurchases	0	(16,917)
Payment of common stock dividends	(15,267)	(15,613)
Debt issuance costs	0	(14)
Net cash used in financing activities	(27,906)	(145,115)
Effect of exchange rate changes on cash and cash equivalents	69	(19)
Decrease in cash and cash equivalents	(75,760)	(98,613)
Cash and cash equivalents at beginning of period	178,571	298,064
Cash and cash equivalents at end of period	$ 102,811	$ 199,451