Business Combinations (Pro Forma) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Document Period End Date	Mar. 31, 2014
Business Acquisition, Pro Forma Information
Revenue	$ 51,404,000	$ 52,566,000
Net income	15,417,000	17,344,000
Basic EPS	$ 0.40	$ 0.47
Diluted EPS	$ 0.40	$ 0.45
Parent, ADAM, Planetsoft, BSI, Taimma, Fintechnix, TriSystems , Combined [Member] [Domain]
Business Acquisition, Pro Forma Information
Business Acquisition, Pro Forma Revenue, Increase (Decrease), Percentage	(3.00%)
Parent, Qatarlyst, and Curepet Combined [Member]
Business Acquisition, Pro Forma Information
Revenue, pro forma	51,466,000	53,063,000
Net income, pro forma	15,407,000	15,405,000
Basic EPS, pro forma	$ 0.40	$ 0.41
Diluted EPS, pro forma	$ 0.40	$ 0.40
Business Acquisition, Pro Forma Revenue, Increase (Decrease)	(1,600,000)
Revenue, Net, Increase (Decrease)	(1,200,000)
Revenue, Net, Increase (Decrease), Percentage	(2.20%)
Impact of Currency Rates [Member]
Business Acquisition, Pro Forma Information
Revenue, Net, Increase (Decrease)	$ (1,900,000)