Accounting Policies Accounting Policies (Details Textuals) (Ten MetroTech Center [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 31, 2013	Oct. 31, 2013
Ten MetroTech Center [Member]
Depreciation, by Property [Line Items]
Accelerated depreciation expense	$ 18,217	$ 45,500

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

No definition available.

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration