UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 3 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
Balance at Mar. 31, 2018	$ 142	$ 130,000	$ (36,016)	$ 277,945	$ 532	$ 372,603
Balance (in shares) at Mar. 31, 2018	13,761					13,761
Issuance of restricted stock awards	$ 1	0	0	0	0	$ 1
Issuance of restricted stock awards (in shares)	70
Share-based compensation	$ 0	1,693	0	0	0	1,693
Repurchase of common stock	$ 0	0	(9,059)	0	0	(9,059)
Repurchase of common stock (in shares)	(108)
Net earnings	$ 0	0	0	15,273	0	15,273
Foreign currency translation adjustment	0	0	0	0	(657)	(657)
Balance at Jun. 30, 2018	$ 143	$ 131,693	$ (45,075)	$ 293,218	$ (125)	$ 379,854
Balance (in shares) at Jun. 30, 2018	13,723					13,723