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, 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
Balance (in shares) at Dec. 31, 2018		25,413
Balance at Dec. 31, 2018	296,668	$ 25,413	122,667	590,655	0	(443,304)	1,237
Increase (Decrease) in Equity
Net (loss) income	(2,744)			(3,184)			440
Distributions to non-controlling interest holders	(620)						(620)
Share-based compensation expense	2,621		2,621
Exercise of stock options and issuance of restricted shares	28			(1,549)		1,577
Treasury shares withheld for the payment of tax on restricted share unit and restricted share issuances and stock option exercises	(585)			(1,163)		578
Balance (in shares) at Mar. 31, 2019		25,413
Balance at Mar. 31, 2019	$ 295,368	$ 25,413	$ 125,288	$ 584,759	$ 0	$ (441,149)	$ 1,057