Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Debt Instrument [Line Items]
Borrowings under short-term line of credit	$ 0	$ 24,219	$ 275,522
Long-term debt
Total current maturities of long-term debt	44,232	15,145	32,655
Total long-term debt, less current maturities	381,018	427,243	312,404
Nonrecourse
Debt Instrument [Line Items]
Borrowings under short-term line of credit	0	4,219	522
Long-term debt
Total current maturities of long-term debt	3,277	2,496	1,716
Total long-term debt, less current maturities	8,223	20,067	25,686
Recourse
Debt Instrument [Line Items]
Borrowings under short-term line of credit	0	20,000	275,000
Long-term debt
Total current maturities of long-term debt	40,955	12,649	30,939
Total long-term debt, less current maturities	$ 372,795	$ 407,176	$ 286,718

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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