Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2014	$ 282,283	$ 279	$ 119,777	$ 177,237	$ (16,595)	$ (182)	$ 1,767
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(176)			9,200			(9,376)
Other comprehensive income (loss)	(3,271)					(3,271)
Exercise of stock options	364		(287)		651
Tax effect of exercised stock options and vesting of deferred shares	1,731		1,731
Issuance of deferred shares	0		(4,584)		4,584
Treasury shares sold to Employee Stock Purchase Plan	134		47		87
Other treasury share purchases	(2,439)				(2,439)
Stock-based compensation expense	3,168		3,168
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2014	281,794	279	119,852	186,437	(13,712)	(3,453)	(7,609)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2015	284,554	279	123,038	194,394	(18,489)	(5,926)	(8,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	12,857			15,372			(2,515)
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	8,433						8,433
Other comprehensive income (loss)	(3,815)					(3,815)
Exercise of stock options	457		(7)		464
Tax effect of exercised stock options and vesting of deferred shares	3,245		3,245
Issuance of deferred shares	0		(5,706)		5,706
Treasury shares sold to Employee Stock Purchase Plan	166		89		77
Other treasury share purchases	(4,488)				(4,488)
Stock-based compensation expense	3,509		3,509
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2015	$ 304,918	$ 279	$ 124,168	$ 209,766	$ (16,730)	$ (9,741)	$ (2,824)