Income Taxes, ASU 2016-09 (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2017	Sep. 27, 2016	Sep. 26, 2017	Sep. 27, 2016
ASU 2016-09
Income tax (expense) benefit	$ (13,046)	$ (11,381)	$ (41,159)	$ (42,325)
Impact on tax rate (as a percent)	0.90%		2.00%
ASU 2016-09 Compensation-Stock Compensation
ASU 2016-09
Income tax (expense) benefit	$ 400		$ 3,000
Impact on tax rate (as a percent)	0.90%		2.00%

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity-based compensation costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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