SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Foreign tax rate, low end of range (as a percent)			19.00%
Foreign tax rate, high end of range (as a percent)			33.00%
Basic earnings per share:
Net income attributable to DMC	$ 3,754	$ 4,273	$ 8,834	$ 8,892
Less income allocated to RSAs	(83)	(92)	(196)	(192)
Net income allocated to common stock for EPS calculation	3,671	4,181	8,638	8,700
Shares, basic	13,212,246	13,065,397	13,204,086	13,060,009
EPS, basic (in dollars per share)	$ 0.28	$ 0.32	$ 0.65	$ 0.67
Adjust shares for dilutives: Stock-based compensation plans	3,983	6,679	4,173	9,756
Diluted earnings per share:
Net income attributable to DMC	3,754	4,273	8,834	8,892
Less income allocated to RSAs	(83)	(92)	(196)	(192)
Net income allocated to common stock for EPS calculation	$ 3,671	$ 4,181	$ 8,638	$ 8,700
Shares, diluted	13,216,229	13,072,076	13,208,259	13,069,765
EPS, diluted (in dollars per share)	$ 0.28	$ 0.32	$ 0.65	$ 0.67