Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common shares [Member]	Additional Paid-in Capital [Member]	Accumulated deficit [Member]	Accumulated other comprehensive loss [Member]	Non-controlling interest [Member]	Total
Balance at Dec. 31, 2016	$ 300,426	$ 25,522	$ 53,838	$ (13,104)	$ 2,731	$ 369,413
Balance (in shares) at Dec. 31, 2016	85,744
Employee stock purchase plan	$ 409					409
Employee stock purchase plan (in shares)	61
Stock incentive plan	$ 8,064	(3,439)				4,625
Stock incentive plan (in shares)	952
Stock-based compensation		5,709				5,709
Dividends on Series A Preferred Stock			(6,800)			(6,800)
Accretion on Series A Preferred Stock			(1,009)			(1,009)
Net loss			(135,320)		752	(134,568)
Currency translation adjustment				6,223	(39)	6,184
Cash flow hedges, net of income taxes of $130				(305)		(305)
Acquisition of non-controlling interests		214		(82)	(1,869)	(1,737)
Balance at Dec. 30, 2017	$ 308,899	28,006	(89,291)	(7,268)	1,575	241,921
Balance (in shares) at Dec. 30, 2017	86,757
Employee stock purchase plan	$ 630					630
Employee stock purchase plan (in shares)	112
Stock incentive plan	$ 554	(3,517)				1,311
Stock incentive plan (in shares)	4,828
Withholding taxes on stock-based awards		(632)				(632)
Stock-based compensation		7,939				7,939
Dividends on Series A Preferred Stock			(6,800)			(6,800)
Accretion on Series A Preferred Stock			(1,109)			(1,109)
Net loss			(109,205)		62	(109,143)
Currency translation adjustment				(2,704)	145	(2,559)
Cash flow hedges, net of income taxes of $130				305		305
Dividend paid by subsidiary to non-controlling interest					(278)	(278)
Balance at Dec. 29, 2018	$ 314,357	31,796	(206,151)	(9,667)	1,504	131,839
Balance (in shares) at Dec. 29, 2018	87,423
Cumulative effect of adoption of new revenue accounting standard			254			254
Employee stock purchase plan	$ 475					475
Employee stock purchase plan (in shares)	185
Stock incentive plan		(3,120)				504
Stock incentive plan (in shares)	482
Withholding taxes on stock-based awards	$ (3,624)	(394)				(394)
Stock-based compensation		7,485				7,485
Dividends on Series A Preferred Stock			(6,800)			(6,800)
Accretion on Series A Preferred Stock			(1,222)			(1,222)
Net loss			(758)		(154)	(604)
Currency translation adjustment				(1,604)	(10)	(1,614)
Dividend paid by subsidiary to non-controlling interest					(31)	(31)
Capital contribution to majority-owned subsidiary					271	271
Balance at Dec. 28, 2019	$ 318,456	$ 35,767	$ (214,931)	$ (11,271)	$ 1,888	$ 129,909
Balance (in shares) at Dec. 28, 2019	88,090