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 [Member]	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				11,362		11,362
Net unrealized loss from currency translation adjustment, net of tax benefit			(1,322)			(1,322)
Shares repurchased	$ (10)	(25,012)				(25,022)
Shares repurchased (in shares)	(1,058,000)
Shares issued under stock compensation plans	$ 1	154				155
Shares issued under stock compensation plans (in shares)	127,000
Cancellation of restricted stock units in satisfaction of withholding tax		(866)				(866)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(41,000)
Stock-based compensation, net of forfeitures		2,755				2,755
Tax benefit on disqualified disposition of shares		189				189
Balances at Sep. 30, 2016	$ 66	5,940	(1,843)	192,311		$ 196,474
Balances (in shares) at Sep. 30, 2016	6,576,000
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						197,533
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				19,449		19,449
Net unrealized loss from currency translation adjustment, net of tax benefit			405			405
Net unrealized gain from derivative instruments, net of tax expense			105			105
Shares repurchased	$ (2)	(3,544)				(3,546)
Shares repurchased (in shares)	(155,000)
Shares issued under stock compensation plans	$ 2	175				177
Shares issued under stock compensation plans (in shares)	216,000
Cancellation of restricted stock units in satisfaction of withholding tax		(747)				(747)
Cancellation of restricted stock units in satisfaction of withholding tax (in shares)	(30,000)
Stock-based compensation, net of forfeitures		3,228				3,228
Issuance of preferred stock					$ 29,700
Accretion of preferred stock issuance costs				(25)	25	(25)
Preferred stock dividends paid				(988)		(988)
Balances at Sep. 30, 2017	$ 64	$ 1,624	$ (535)	$ 214,438	$ 49,485	$ 215,591
Balances (in shares) at Sep. 30, 2017	6,433,000				2,500
Increase (Decrease) in Shareholders' Equity
Issuance of preferred stock (in shares)					1,500	2,500,000