Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net earnings	$ 10,568	$ 22,792
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	13,873	12,655
Amortization of deferred costs	125	126
(Gain) loss on disposal of property, plant, equipment and leased railcars	(13)	25
Earnings from joint ventures	(550)	(1,486)
Provision for deferred income taxes	12,780	8,640
Changes in operating assets and liabilities:
Accounts receivable, net	14,310	694
Accounts receivable, due from related parties	(1,680)	2,071
Income taxes receivable	(52)	1,246
Inventories, net	(3,770)	21,429
Prepaid expenses and other current assets	52	(1,796)
Accounts payable	897	(9,786)
Accounts payable, due to related parties	311	(1,999)
Accrued expenses and taxes	(5,482)	3,674
Other	1,050	(417)
Net cash provided by operating activities	42,419	57,868
Investing activities:
Purchases of property, plant and equipment	(1,550)	(4,367)
Grant Proceeds	100	0
Capital expenditures - leased railcars	(55,909)	(20,620)
Proceeds from sale of property, plant, and equipment and leased railcars	73	640
Proceeds from repayments of loans and distributions from joint ventures	1,477	1,477
Net cash used in investing activities	(55,809)	(22,870)
Financing activities:
Repayments of debt	(6,310)	(106,402)
Change in restricted cash related to long-term debt	3	142
Stock repurchases	0	(10,872)
Payment of common stock dividends	(7,633)	(7,825)
Debt issuance costs	0	(10)
Net cash used in financing activities	(13,940)	(124,967)
Effect of exchange rate changes on cash and cash equivalents	5	(14)
Decrease in cash and cash equivalents	(27,325)	(89,983)
Cash and cash equivalents at beginning of period	178,571	298,064
Cash and cash equivalents at end of period	$ 151,246	$ 208,081