STOCK REPURCHASE PROGRAMS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Jun. 30, 2005	Dec. 31, 2014	Nov. 03, 2011
Equity [Abstract]
Authorized amount of stock repurchase program			$ 15,000
Parent entity stock purchase program authorized amount	15,000
Parent entity stock purchase program remaining authorized purchase amount		$ 4,491

The amount authorized by parent company of entity to purchase the subsidiary's common stock in the open market under a stock repurchase plan.

No definition available.

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