Subsequent Event (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended	1 Months Ended
Nov. 30, 2013 sqft	Dec. 31, 2013 Subsequent Event [Member] Addison, IL [Member] sqft
Area of Land	609,000	68,000
Proceeds from Sale of Buildings	$ 49.2	$ 1.9

The cash inflow from sale of buildings.

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 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

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

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