QUARTERLY INFORMATION (Details 1) (USD $)	3 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Quarterly Financial Information [Line Items]
Dividends Declared	$ 0.190	$ 0.190	$ 0.165	$ 0.165	$ 0.165	$ 0.165	$ 0.140	$ 0.140
Low Bid	$ 26.75cmoh_LowBidPrice	$ 24.25cmoh_LowBidPrice	$ 23.75cmoh_LowBidPrice	$ 22.30cmoh_LowBidPrice	$ 20.33cmoh_LowBidPrice	$ 20.55cmoh_LowBidPrice	$ 20.00cmoh_LowBidPrice	$ 18.90cmoh_LowBidPrice
High Bid	$ 29.00cmoh_HighBidPrice	$ 29.00cmoh_HighBidPrice	$ 24.59cmoh_HighBidPrice	$ 25.38cmoh_HighBidPrice	$ 22.68cmoh_HighBidPrice	$ 22.88cmoh_HighBidPrice	$ 21.98cmoh_HighBidPrice	$ 21.88cmoh_HighBidPrice

Aggregate dividends declared during the period for each share of common stock outstanding.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration