Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net earnings	$ 22,792	$ 34,976
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	12,655	10,061
Amortization of deferred costs	126	152
Loss on disposal of property, plant, equipment and leased railcars	25	0
Earnings from joint ventures	(1,486)	(1,797)
Provision for deferred income taxes	8,640	4,717
Provision for allowance for doubtful accounts receivable	(126)	(16)
Items related to financing activities:
Loss on debt extinguishment	0	2,126
Changes in operating assets and liabilities:
Accounts receivable, net	820	(6,149)
Accounts receivable, due from related parties	2,071	20,391
Increase (Decrease) in Income Taxes Receivable	1,246	22,272
Inventories, net	21,429	(4,730)
Prepaid expenses and other current assets	(1,796)	(897)
Accounts payable	(9,786)	8,804
Accounts payable, due to related parties	(1,999)	511
Accrued expenses and taxes	3,674	(1,077)
Other	(417)	(3,770)
Net cash provided by operating activities	57,868	85,574
Investing activities:
Purchases of property, plant and equipment	(4,367)	(4,972)
Capital expenditures - leased railcars	(20,620)	(48,095)
Proceeds from Sale of Property, Plant, and Equipment	640	0
Proceeds from repayments of loans by joint ventures	1,477	1,250
Net cash used in investing activities	(22,870)	(51,817)
Financing activities:
Repayments of long-term debt	(106,402)	(413,275)
Proceeds from long-term debt	0	625,306
Increase (Decrease) in Restricted Cash	142	(9,794)
Payments for Repurchase of Common Stock	(10,872)	0
Payment of common stock dividends	(7,825)	(8,541)
Debt issuance costs	(10)	(5,271)
Net cash (used in) provided by financing activities	(124,967)	188,425
Effect of exchange rate changes on cash and cash equivalents	(14)	(235)
(Decrease) Increase in cash and cash equivalents	(89,983)	221,947
Cash and cash equivalents at beginning of period	298,064	88,109
Cash and cash equivalents at end of period	$ 208,081	$ 310,056