Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income [Member]
BALANCE at Dec. 31, 2016	$ 153,977	$ 321	$ 158,581	$ 7,294	$ (12,219)
BALANCE, Shares at Dec. 31, 2016		32,135,176
BALANCE, Treasury Shares at Dec. 31, 2016					(650,402)
Net income	6,364			6,364
Issuance of Common Stock for Acquisition, Value	10,859	$ 3	10,856
Issuance of Common Stock for Acquisition, Shares		282,577
Surrender of Common Stock Awards by Employees, Value	(54)				$ (54)
Surrender of Common Stock Awards by Employees, Shares					(1,392)
Share-Based Compensation Expense	480		480
BALANCE at Mar. 31, 2017	171,626	$ 324	169,917	13,658	$ (12,273)
BALANCE, Shares at Mar. 31, 2017		32,417,753
BALANCE, Treasury Shares at Mar. 31, 2017					(651,794)
BALANCE at Dec. 31, 2017	$ 210,528	$ 325	174,043	48,434	$ (12,781)	$ 507
BALANCE, Shares at Dec. 31, 2017	32,524,934	32,524,934
BALANCE, Treasury Shares at Dec. 31, 2017	(662,788)				(662,788)
Net income	$ 6,394			6,394
Cumulative Effect of Accounting Changes, Net of Tax	2,888			2,776		112
Issuance of Common Stock Awards to Employees, Value		$ 1	(1)
Issuance of Common Stock Awards to Employees, Shares		70,390
Surrender of Common Stock Awards by Employees, Value	(56)				$ (56)
Surrender of Common Stock Awards by Employees, Shares					(1,212)
Share-Based Compensation Expense	2,307		2,307
Common Stock Repurchase,Value	(24,640)				$ (24,640)
Common Stock Repurchase , Shares					(412,717)
Other Comprehensive Income, Net of Tax	1,160					1,160
BALANCE at Mar. 31, 2018	$ 198,581	$ 326	$ 176,349	$ 57,604	$ (37,477)	$ 1,779
BALANCE, Shares at Mar. 31, 2018	32,595,324	32,595,324
BALANCE, Treasury Shares at Mar. 31, 2018	(1,076,717)				(1,076,717)