Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net earnings	$ 99,533us-gaap_NetIncomeLoss	$ 86,896us-gaap_NetIncomeLoss	$ 63,823us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	34,212us-gaap_Depreciation	27,712us-gaap_Depreciation	23,850us-gaap_Depreciation
Amortization of deferred costs	549us-gaap_AmortizationOfFinancingCosts	633us-gaap_AmortizationOfFinancingCosts	605us-gaap_AmortizationOfFinancingCosts
(Gain) loss on disposal of property, plant, equipment and leased railcars	(71)us-gaap_GainLossOnDispositionOfAssets	24us-gaap_GainLossOnDispositionOfAssets	37us-gaap_GainLossOnDispositionOfAssets
Change in interest receivable, due from affiliates	0	0	292
(Earnings) loss from joint ventures	(1,570)	8,595	451
Provision for deferred income taxes	72,369us-gaap_DeferredIncomeTaxExpenseBenefit	39,707us-gaap_DeferredIncomeTaxExpenseBenefit	37,113us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for allowance for doubtful accounts receivable	1,064us-gaap_ProvisionForDoubtfulAccounts	48us-gaap_ProvisionForDoubtfulAccounts	90us-gaap_ProvisionForDoubtfulAccounts
Item related to investing activities:
Realized and unrealized gains on short-term investments—available for sale securities	0	(141)	(3,730)
Item related to financing activities:
Loss on debt extinguishment	1,896	392	2,267
Changes in operating assets and liabilities:
Accounts receivable, net	(12,779)	14,077	(2,568)
Accounts receivable, due from affiliates	(16,703)	(12,904)	2,588
Income taxes receivable	(31,576)	(2,316)	4,057
Inventories, net	(26,935)us-gaap_IncreaseDecreaseInInventories	19,819us-gaap_IncreaseDecreaseInInventories	(14,224)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(4,244)	(398)	621
Accounts payable	16,034	(12,184)	2,653
Accounts payable, due to related parties	1,383	(1,421)	2,031
Accrued expenses and taxes	639	5,468	3,633
Other	2,998	(9,241)	(2,211)
Net cash provided by operating activities	136,799	164,766	121,378
Investing activities:
Purchases of property, plant and equipment	(20,070)	(22,025)	(19,962)
Capital expenditures—leased railcars	(307,680)	(162,068)	(185,918)
Proceeds from the sale of property, plant, equipment and leased railcars	800	54	259
Purchase of short-term investments—available for sale securities	0	0	(40,334)
Proceeds from the sale of short-term investments—available for sale securities	0	12,699	31,506
Proceeds from repayments of loans by joint ventures and sale of investment in joint venture	3,750	5,100	1,908
Investments in and loans to joint ventures	0	(136)	(1,856)
Net cash used in investing activities	(323,200)	(166,376)	(214,397)
Financing activities:
Repayments of short-term and long-term debt	(204,486)us-gaap_RepaymentsOfSeniorDebt	(180,083)us-gaap_RepaymentsOfSeniorDebt	(100,000)us-gaap_RepaymentsOfSeniorDebt
Proceeds from short-term and long-term debt	418,682	99,841	100,000
Change in interest reserve related to long-term debt	13	(3,908)	0
Premium paid on debt redemption	0	0	(1,875)
Payment of common stock dividends	(34,164)us-gaap_PaymentsOfDividendsCommonStock	(21,352)us-gaap_PaymentsOfDividendsCommonStock	(5,338)us-gaap_PaymentsOfDividendsCommonStock
Debt issuance costs	(2,566)us-gaap_PaymentsOfDebtIssuanceCosts	(543)us-gaap_PaymentsOfDebtIssuanceCosts	(1,917)us-gaap_PaymentsOfDebtIssuanceCosts
Net cash provided by (used in) financing activities	177,479	(106,045)	(9,130)
Effect of exchange rate changes on cash and cash equivalents	(221)	(138)	22
Decrease in cash and cash equivalents	(9,143)	(107,793)	(102,127)
Cash and cash equivalents at beginning of year	97,252	205,045	307,172
Cash and cash equivalents at end of year	88,109	97,252	205,045
Retained Earnings [Member]
Operating activities:
Net earnings		$ 86,896	$ 63,823

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The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

+ References

No definition available.

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

+ Details

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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