Condensed consolidated guarantor financial information Adjustments to condensed consolidating statements of cash flows within guarantor financial information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations	$ 208,798	$ 135,872
Intercompany transactions	0	0
Intercompany dividends paid	0	0
Net cash used in financing activities from continuing operations	(274,030)	(53,643)
Scenario, Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Intercompany transactions		0
Intercompany dividends paid		0
Scenario, Adjustment | Before Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations		0
Scenario, Adjustment | After Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in financing activities from continuing operations		0
Consolidation, Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations	(75,340)	(66,071)
Intercompany transactions	0	0
Intercompany dividends paid	(305,122)	(66,071)
Net cash used in financing activities from continuing operations	305,122	66,071
Consolidation, Eliminations | Scenario, Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Intercompany transactions		0
Intercompany dividends paid		66,071
Consolidation, Eliminations | Scenario, Adjustment | Before Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations		(66,071)
Consolidation, Eliminations | Scenario, Adjustment | After Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in financing activities from continuing operations		66,071
Parent Company
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations	(80,537)	(85,753)
Intercompany transactions	372,762	70,932
Intercompany dividends paid	0	0
Net cash used in financing activities from continuing operations	99,826	34,392
Parent Company | Scenario, Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Intercompany transactions		(1,200)
Intercompany dividends paid		0
Parent Company | Scenario, Adjustment | Before Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations		1,200
Parent Company | Scenario, Adjustment | After Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in financing activities from continuing operations		(1,200)
Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations	300,960	147,461
Intercompany transactions	(294,661)	(72,574)
Intercompany dividends paid	0	17,400
Net cash used in financing activities from continuing operations	(294,661)	(104,776)
Guarantor Subsidiaries | Scenario, Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Intercompany transactions		(43,734)
Intercompany dividends paid		(17,400)
Guarantor Subsidiaries | Scenario, Adjustment | Before Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations		61,134
Guarantor Subsidiaries | Scenario, Adjustment | After Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in financing activities from continuing operations		(61,134)
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations	63,715	140,235
Intercompany transactions	(78,101)	1,642
Intercompany dividends paid	305,122	48,671
Net cash used in financing activities from continuing operations	(384,317)	(49,330)
Non-Guarantor Subsidiaries | Scenario, Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Intercompany transactions		44,934
Intercompany dividends paid		(48,671)
Non-Guarantor Subsidiaries | Scenario, Adjustment | Before Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities from continuing operations		3,737
Non-Guarantor Subsidiaries | Scenario, Adjustment | After Adjustment
Condensed Cash Flow Statements, Captions [Line Items]
Net cash used in financing activities from continuing operations		$ (3,737)