Business Combinations (Pro Forma) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Acquisition, Pro Forma Information
Revenue	$ 51,476,000	$ 51,004,000	$ 102,880,000	$ 103,570,000
Net income	13,579,000	13,542,000	28,996,000	30,886,000
Basic EPS	$ 0.35	$ 0.36	$ 0.76	$ 0.83
Diluted EPS	$ 0.35	$ 0.35	$ 0.75	$ 0.80
Revenue, Net, Increase (Decrease)	500,000		(700,000)
Revenue, Net, Increase (Decrease), Percentage	0.90%		(0.70%)
Parent, Qatarlyst, Curepet , Healthcare Magic Combined [Member]
Business Acquisition, Pro Forma Information
Revenue, pro forma	51,610,000	50,855,000	103,419,000	104,300,000
Net income, pro forma	13,553,000	12,986,000	28,960,000	28,468,000
Basic EPS, pro forma	$ 0.35	$ 0.35	$ 0.75	$ 0.77
Diluted EPS, pro forma	$ 0.35	$ 0.33	$ 0.75	$ 0.73
Business Acquisition, Pro Forma Revenue, Increase (Decrease)	800,000		(900,000)
Business Acquisition, Pro Forma Revenue, Increase (Decrease), Percentage	1.50%		(0.80%)
Impact of Currency Rates [Member]
Business Acquisition, Pro Forma Information
Revenue, Net, Increase (Decrease)	$ (500,000)		$ 2,300,000