UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 3 months ended Jun. 30, 2017 - 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, 2017	$ 142	$ 123,536	$ 0	$ 222,823	$ (583)	$ 345,918
Balance (in shares) at Mar. 31, 2017	14,161					14,161
Issuance of restricted stock awards	$ 0	0	0	0	0	$ 0
Issuance of restricted stock awards (in shares)	64
Share-based compensation	$ 0	1,507	0	0	0	1,507
Repurchase of common stock	$ 0	0	(4,130)	0	0	(4,130)
Repurchase of common stock (in shares)	(55)
Net earnings	$ 0	0	0	13,423	0	13,423
Foreign currency translation adjustment	0	0	0	0	312	312
Balance at Jun. 30, 2017	$ 142	$ 125,043	$ (4,130)	$ 236,246	$ (271)	$ 357,030
Balance (in shares) at Jun. 30, 2017	14,170					14,170