CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net earnings available to common stockholders	$ 6,062	$ 3,065	$ 11,382	$ 5,568
Other comprehensive income (loss):
Currency translation adjustment, net of taxes of ($34) in the three months ended June 30, 2015, $89 in the three months ended June 30, 2014, ($194) in the six months ended June 30, 2015 and $123 in the six months ended June 30, 2014	3,535	368	(6,801)	537
Unrealized holding gains on marketable securities arising during the period, net of taxes of ($18) in the three months ended June 30, 2015, $48 in the three months ended June 30, 2014, $15 in the six months ended June 30, 2015 and $65 in the six months ended June 30, 2014	(30)	78	25	106
Change in unfunded SERP liability, net of taxes of $28 in the three months ended June 30, 2015, $14 in the three months ended June 30, 2014, $56 in the six months ended June 30, 2015 and $28 in the six months ended June 30, 2014.	64	32	128	63
Other comprehensive income (loss)	3,569	478	(6,648)	706
Comprehensive income	$ 9,631	$ 3,543	$ 4,734	$ 6,274