CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income	Treasury stock, at cost	Non-controlling interests
Balance at Dec. 31, 2014	$ 41,443	$ 25,413	$ 91,509	$ 367,967	$ 0	$ (444,495)	$ 1,049
Balance (in shares) at Dec. 31, 2014		25,413
Increase (Decrease) in Equity
Net income	51,254			49,648			1,606
Other comprehensive income (loss), net of tax	0
Distributions to non-controlling interest holders	(1,347)						(1,347)
Share-based compensation expense	1,315		1,315
Exercise of stock options	203			(1,701)		1,904
Repurchase of shares	(43,965)					(43,965)
Balance at Jun. 30, 2015	48,903	$ 25,413	92,824	415,914	0	(486,556)	1,308
Balance (in shares) at Jun. 30, 2015		25,413
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	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