Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Earnings	$ 42,650	$ 38,501	$ 98,728	$ 90,747
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	618	(535)	1,042	(1,012)
Total Other Comprehensive Income (Loss)	618	(535)	1,042	(1,012)
Comprehensive Income	$ 43,268	$ 37,966	$ 99,770	$ 89,735