Condensed Consolidated Statements of Redeemable Preferred Stock and Shareholders' Equity - USD ($) $ in Thousands	Total	Redeemable Preferred Stock	Common Stock	Paid in Capital in Excess of Par	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balances, beginning of period (in shares) at Dec. 31, 2017		2,500,000	6,419,000
Balances, beginning of period at Dec. 31, 2017	$ 258,910	$ 49,471	$ 64	$ 2,319	$ 256,301	$ 226
Net income	7,082				7,082
Net unrealized gain from currency translation adjustment, net of tax expense	453					453
Net unrealized (loss) gain from derivative instruments, net of tax benefit (expense)	799					799
Shares repurchased (in shares)			(297,000)
Shares repurchased	(10,183)		$ (2)	(2,698)	(7,483)
Shares issued under stock compensation plans (in shares)			18,000
Shares issued under stock compensation plans	118		$ 1	117
Cancellation of restricted stock in satisfaction of withholding tax (in shares)			(24,000)
Cancellation of restricted stock in satisfaction of withholding tax	(665)		$ (2)	(663)
Stock-based compensation expense	925			925
Accretion of preferred stock issuance costs	(20)	$ 20			(20)
Preferred stock dividends ($0.32 per share)	(801)				(801)
Balances, end of period (in shares) at Mar. 31, 2018		2,500,000	6,116,000
Balances, end of period at Mar. 31, 2018	256,618	$ 49,491	$ 61	0	255,020	1,537
Balances, beginning of period (in shares) at Dec. 31, 2018		2,500,000	6,176,000
Balances, beginning of period at Dec. 31, 2018	286,787	$ 49,554	$ 62	0	286,623	102
Net income	20,878				20,878
Net unrealized gain from currency translation adjustment, net of tax expense	273					273
Net unrealized (loss) gain from derivative instruments, net of tax benefit (expense)	(474)					(474)
Shares repurchased (in shares)			(7,671)
Shares repurchased	(317)			(317)
Shares issued under stock compensation plans (in shares)			7,000
Shares issued under stock compensation plans	160			160
Cancellation of restricted stock in satisfaction of withholding tax (in shares)			(15,000)
Cancellation of restricted stock in satisfaction of withholding tax	(545)			(545)
Stock-based compensation expense	1,265			1,265
Accretion of preferred stock issuance costs	(21)	$ 21			(21)
Preferred stock dividends ($0.32 per share)	(801)				(801)
Balances, end of period (in shares) at Mar. 31, 2019		2,500,000	6,160,000
Balances, end of period at Mar. 31, 2019	$ 307,438	$ 49,575	$ 62	$ 563	$ 306,912	$ (99)