CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock, at cost	Non-controlling interests
Balance (in shares) at Dec. 31, 2016		25,413
Balance at Dec. 31, 2016	$ 62,194	$ 25,413	$ 107,288	$ 333,786	$ (1,745)	$ (403,953)	$ 1,405
Increase (Decrease) in Equity
Net (loss) income	7,160			6,545			615
Other comprehensive income, net of tax	12,723				12,723
Distributions to non-controlling interest holders	(569)						(569)
Share-based compensation expense	695		695
Exercise of stock options and issuance of restricted shares	752			(2,872)		3,624
Repurchase of shares	(10,590)					(10,590)
Balance (in shares) at Mar. 31, 2017		25,413
Balance at Mar. 31, 2017	72,365	$ 25,413	108,915	336,527	10,978	(410,919)	1,451
Balance (in shares) at Dec. 31, 2017		25,413
Balance at Dec. 31, 2017	339,985	$ 25,413	112,475	626,600	733	(426,609)	1,373
Increase (Decrease) in Equity
Net (loss) income	(3,607)			(4,132)			525
Distributions to non-controlling interest holders	(672)						(672)
Share-based compensation expense	2,201		2,201
Exercise of stock options and issuance of restricted shares	2,617			(12,500)		15,117
Repurchase of shares	(9,994)					(9,994)
Balance (in shares) at Mar. 31, 2018		25,413
Balance at Mar. 31, 2018	$ 320,082	$ 25,413	$ 114,676	$ 600,253	$ 0	$ (421,486)	$ 1,226