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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Other Cumulative Comprehensive Loss	Treasury Stock
Increase (Decrease) in Stockholders' Equity
Adjustment for cumulative effect from change in accounting principle (ASU 2016-16)	$ (65)			$ (65)
Balances (in shares) at Dec. 31, 2017		14,821,801				39,783
Balances at Dec. 31, 2017	105,780	$ 741	$ 76,146	60,074	$ (30,819)	$ (362)
Increase (Decrease) in Stockholders' Equity
Net income	15,202			15,202
Change in cumulative foreign currency translation adjustment	(2,987)				(2,987)
Shares issued in connection with stock compensation plans (in shares)		156,378
Shares issued in connection with stock compensation plans	232	$ 8	224
Stock-based compensation	2,574		2,574
Dividends declared	(893)			(893)
Treasury stock purchases (in shares)						(42,353)
Treasury stock purchases	(453)					$ (453)
Balances (in shares) at Sep. 30, 2018		14,978,179				82,136
Balances at Sep. 30, 2018	$ 119,390	$ 749	$ 78,944	$ 74,318	$ (33,806)	$ (815)