Convertible Senior Notes (Tables)

12 Months Ended

Dec. 27, 2014

Debt Disclosure [Abstract]

Components of Convertible Senior Notes

The carrying amounts of the liability components of the Notes were as follows (in thousands):

	December 27, 2014			December 28, 2013
Principal	$	150,000		$	150,000
Unamortized discount (1)	(30,257		)	(37,322		)
Carrying amount	119,743			112,678

⁽¹⁾  Unamortized discount includes debt conversion discount and issuance costs, which will be amortized over the remaining life of the Notes, which is approximately 4 years.

The carrying amounts of the liability components of the Notes were as follows (in thousands):

	December 27, 2014			December 28, 2013
Principal	$	150,000		$	150,000
Unamortized discount (1)	(30,257		)	(37,322		)
Carrying amount	119,743			112,678

⁽¹⁾  Unamortized discount includes debt conversion discount and issuance costs, which will be amortized over the remaining life of the Notes, which is approximately 4 years.

Schedule of Long-term Debt Instruments [Table Text Block]

As of December 27, 2014 and December 28, 2013, the carrying amount of the equity components of the Notes was as follows (in thousands):

Debt discount related to value of conversion option	45,000
Debt issuance cost	(1,659	)
Total	43,341

Interest Expense Recognized Related to Notes

The following table sets forth total interest expense recognized related to the Notes (in thousands):

	Years Ended
	December 27, 2014		December 28, 2013
Contractual interest expense	$	2,626	$	1,539
Amortization of debt issuance costs	665		358
Amortization of debt discount	7,730		4,164
Total interest expense	$	11,021	$	6,061