Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Debt Instrument [Line Items]
Short-term debt	$ 311,660us-gaap_ShortTermBorrowings	$ 2,166us-gaap_ShortTermBorrowings	$ 226,100us-gaap_ShortTermBorrowings
Long-term debt
Total current maturities of long-term debt	19,037us-gaap_LongTermDebtCurrent	76,415us-gaap_LongTermDebtCurrent	90,760us-gaap_LongTermDebtCurrent
Total long-term debt, less current maturities	323,258us-gaap_LongTermDebtNoncurrent	298,638us-gaap_LongTermDebtNoncurrent	306,161us-gaap_LongTermDebtNoncurrent
Nonrecourse
Long-term debt
Total current maturities of long-term debt	0	0	6,012
Total long-term debt, less current maturities	0	0	3,288
Recourse
Debt Instrument [Line Items]
Short-term debt	311,660	2,166	226,100
Long-term debt
Total current maturities of long-term debt	19,037	76,415	84,748
Total long-term debt, less current maturities	$ 323,258	$ 298,638	$ 302,873

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),16(a)(1))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2, 3

-Article 9

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