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 at Dec. 31, 2015	$ 52,270	$ 25,413	$ 96,321	$ 369,270	$ 0	$ (440,026)	$ 1,292
Balance (in shares) at Dec. 31, 2015		25,413
Increase (Decrease) in Equity
Net income	39,578			38,488			1,090
Other comprehensive income (loss), net of tax	(7,172)				(7,172)
Distributions to non-controlling interest holders	(1,065)						(1,065)
Share-based compensation expense	3,569		3,569
Exercise of stock options and issuance of restricted shares	986			(4,298)		5,284
Repurchase of shares	(19,746)					(19,746)
Balance at Jun. 30, 2016	68,420	$ 25,413	99,890	403,460	(7,172)	(454,488)	1,317
Balance (in shares) at Jun. 30, 2016		25,413
Balance at Dec. 31, 2016	62,194	$ 25,413	107,288	333,786	(1,745)	(403,953)	1,405
Balance (in shares) at Dec. 31, 2016		25,413
Increase (Decrease) in Equity
Net income	16,882			15,580			1,302
Other comprehensive income (loss), net of tax	5,742				5,742
Distributions to non-controlling interest holders	(1,056)						(1,056)
Share-based compensation expense	1,858		1,858
Exercise of stock options and issuance of restricted shares	765			(5,014)		5,779
Treasury shares withheld for the payment of tax on restricted share issuances	(1,089)			(1,494)		405
Repurchase of shares	(18,573)					(18,573)
Balance at Jun. 30, 2017	$ 66,723	$ 25,413	$ 110,078	$ 341,926	$ 3,997	$ (416,342)	$ 1,651
Balance (in shares) at Jun. 30, 2017		25,413