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		$ 174,489	$ 216,648
Balances (in shares) at Dec. 31, 2014	8,346
Increase (Decrease) in Shareholders' Equity
Net income				872	872
Shares repurchased	$ (1)	(2,038)			(2,039)
Shares repurchased (in shares)	(108)
Shares issued under stock compensation plans	$ 1	84			85
Shares issued under stock compensation plans (in shares)	26
Cancellation of restricted stock units in satisfaction of withholding tax	$ (1)	(861)			(862)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(43)
Stock-based compensation, net of forfeitures		1,947			1,947
Tax benefit on disqualified disposition of shares		130			130
Balances at Jun. 30, 2015	$ 82	41,338		175,361	216,781
Balances (in shares) at Jun. 30, 2015	8,221
Balances at Dec. 31, 2015	$ 75	28,720	$ (521)	180,949	209,223
Balances (in shares) at Dec. 31, 2015	7,548
Increase (Decrease) in Shareholders' Equity
Net income				7,377	7,377
Net unrealized loss from derivative instruments, net of tax benefit			345		345
Shares repurchased	$ (9)	(22,390)			(22,399)
Shares repurchased (in shares)	(942)
Shares issued under stock compensation plans	$ 1	81			82
Shares issued under stock compensation plans (in shares)	112
Cancellation of restricted stock units in satisfaction of withholding tax		(581)			(581)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(29)
Stock-based compensation, net of forfeitures		1,849			1,849
Tax benefit on disqualified disposition of shares		254			254
Balances at Jun. 30, 2016	$ 67	$ 7,933	$ (176)	$ 188,326	$ 196,150
Balances (in shares) at Jun. 30, 2016	6,689