Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Paid-in Capital in Excess of par	Accumulated Other Comprehensive Income	Retained Earnings	Preferred Stock	Total
Balances at Dec. 31, 2015	$ 75	$ 28,720	$ (521)	$ 180,949		$ 209,223
Balances (in shares) at Dec. 31, 2015	7,548,000
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders				7,377		7,377
Net unrealized loss from currency translation adjustment, net of tax benefit			345			345
Shares repurchased	$ (9)	(22,390)				(22,399)
Shares repurchased (in shares)	(942,000)
Shares issued under stock compensation plans	$ 1	81				82
Shares issued under stock compensation plans (in shares)	112,000
Cancellation of restricted stock units in satisfaction of withholding tax		(581)				(581)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(29,000)
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	6,689,000
Increase (Decrease) in Shareholders' Equity
Issuance of preferred stock (in shares)						1,000,000
Cumulative-effect adjustment				1,273		$ 1,273
Balance, adjusted	$ 64	2,512	(1,045)	196,002	$ 19,760	197,533
Balances (Scenario, Previously Reported) at Dec. 31, 2016	$ 64	2,512	(1,045)	194,729	$ 19,760	196,260
Balances at Dec. 31, 2016						196,260
Balances (in shares) (Scenario, Previously Reported) at Dec. 31, 2016	6,402,000				1,000
Balances (in shares) at Dec. 31, 2016	6,402,000				1,000
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders				14,158		14,158
Net unrealized loss from currency translation adjustment, net of tax benefit			214			214
Net unrealized gain from derivative instruments, net of tax expense			(3)			(3)
Shares repurchased	$ (2)	(3,347)				(3,349)
Shares repurchased (in shares)	(155,000)
Shares issued under stock compensation plans	$ 2	91				93
Shares issued under stock compensation plans (in shares)	211,000
Cancellation of restricted stock units in satisfaction of withholding tax		(622)				(622)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(18,000)
Stock-based compensation, net of forfeitures		2,074				2,074
Accretion of preferred stock issuance costs				(17)	$ 17	(17)
Preferred stock dividends paid				(646)		(646)
Balances at Jun. 30, 2017	$ 64	$ 708	$ (834)	$ 209,497	$ 19,777	$ 209,435
Balances (in shares) at Jun. 30, 2017	6,440,000				1,000
Increase (Decrease) in Shareholders' Equity
Issuance of preferred stock (in shares)						1,000,000