Commitments and Contingencies (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating leases future minimum rentals and service income
Future Rental and Service Income - Operating Leases, 2013	$ 59,747
Future Rental and Service Income - Operating Leases, 2014	45,435
Future Rental and Service Income - Operating Leases, 2015	35,401
Future Rental and Service Income - Operating Leases, 2016	28,070
Future Rental and Service Income - Operating Leases, 2017	18,119
Future Rental and Service Income - Operating Leases, Future years	22,702
Future Rental and Service Income - Operating Leases, Total	209,474
Future Minimum Rental Payments, 2013	12,958
Future Minimum Rental Payments, 2014	10,310
Future Minimum Rental Payments, 2015	9,772
Future Minimum Rental Payments, 2016	7,859
Future Minimum Rental Payments, 2017	5,316
Future Minimum Rental Payments, Future years	6,238
Future Minimum Rental Payments, Total	$ 52,453

Name:	ande_OperatingLeasesFutureMinimumRentalsAndServiceIncomeAndRentalPaymentsAbstract
Namespace Prefix:	ande_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Operating leases future rental and service income.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncome
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future rental and service income current.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncomeCurrent
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future rental and service income in five years.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncomeInFiveYears
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future rental and service income in four years.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncomeInFourYears
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future rental and service income in three years.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncomeInThreeYears
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future rental and service income in two years.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncomeInTwoYears
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Operating leases future rental and service income thereafter.

+ References

No definition available.

+ Details

Name:	ande_OperatingLeasesFutureRentalAndServiceIncomeThereafter
Namespace Prefix:	ande_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 23

-Subparagraph b(ii)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future rental payments receivable within one year of the balance sheet date under an operating lease.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future rental payments receivable within the third year from the balance sheet date under an operating lease.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future rental payments receivable within the second year from the balance sheet date under an operating lease.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant