Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Earnings	$ 139,283	$ 135,709	$ 78,233
Other Comprehensive Loss:
Foreign Currency Translation Adjustment	(14)	(427)	(26)
Total Other Comprehensive Loss	(14)	(427)	(26)
Comprehensive Income	$ 139,269	$ 135,282	$ 78,207