Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Paid-in Capital in Excess of par	Accumulated Other Comprehensive Income	Retained Earnings	Total
Balances at Dec. 31, 2014	$ 83	$ 42,076		$ 174,702	$ 216,861
Balances (in shares) at Dec. 31, 2014	8,346
Increase (Decrease) in Shareholders' Equity
Net income				2,298	2,298
Shares repurchased		(724)			(724)
Shares repurchased (in shares)	(38)
Shares issued under stock compensation plans		85			85
Shares issued under stock compensation plans (in shares)	(10)
Cancellation of restricted stock units in satisfaction of withholding tax		(514)			(514)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(25)
Stock-based compensation, net of forfeitures		1,074			1,074
Tax benefit on disqualified disposition of shares		143			143
Balances at Mar. 31, 2015	$ 83	42,140		177,000	219,223
Balances (in shares) at Mar. 31, 2015	8,293
Balances at Dec. 31, 2015	$ 75	28,720	$ (521)	182,058	210,332
Balances (in shares) at Dec. 31, 2015	7,548
Increase (Decrease) in Shareholders' Equity
Net income				3,768	3,768
Net unrealized loss from derivative instruments, net of tax benefit			(288)		(288)
Shares repurchased	$ (2)	(4,451)			(4,453)
Shares repurchased (in shares)	(200)
Shares issued under stock compensation plans	$ 1	81			82
Shares issued under stock compensation plans (in shares)	98
Cancellation of restricted stock units in satisfaction of withholding tax		(424)			(424)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(22)
Stock-based compensation, net of forfeitures		944			944
Tax benefit on disqualified disposition of shares		55			55
Balances at Mar. 31, 2016	$ 74	$ 24,925	$ (809)	$ 185,826	$ 210,016
Balances (in shares) at Mar. 31, 2016	7,424