BASIS OF PRESENTATION Payments to Acquire Limited Partnership Interests (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Payments to Acquire Investments [Abstract]
Payments to Acquire Universa Limited Partnership Interest	$ 4,367

Cash outflow related to the acquisition or continued holding of Universa limited partnership interest held for investment purposes.

No definition available.

Name:	emci_PaymentstoAcquireUniversaLimitedPartnershipInterest
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration