Fair value measurement (Tables)

9 Months Ended

Sep. 25, 2016

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis

The following tables provide information regarding the Company's financial assets and liabilities that are measured at fair value on a recurring basis as of September 25, 2016 and December 31, 2015:

	Total carrying value at September 25, 2016		Quoted prices in active markets (Level 1)		Significant other observable Inputs (Level 2)		Significant unobservable Inputs (Level 3)
	(Dollars in thousands)
Investments in marketable securities	$	7,411	$	7,411	$	—	$	—
Derivative assets	1,134		—		1,134		—
Derivative liabilities	2,403		—		2,403		—
Contingent consideration liabilities	22,368		—		—		22,368

	Total carrying value at December 31, 2015		Quoted prices in active markets (Level 1)		Significant other observable Inputs (Level 2)		Significant unobservable Inputs (Level 3)
	(Dollars in thousands)
Investments in marketable securities	$	6,922	$	6,922	$	—	$	—
Derivative assets	329		—		329		—
Derivative liabilities	1,298		—		1,298		—
Contingent consideration liabilities	20,829		—		—		20,829

Reconciliation of Changes in Level 3 Financial Liabilities Measured at Fair Value on Recurring Basis

The following table provides information regarding changes, during the nine months ended September 25, 2016, in Level 3 financial liabilities related to contingent consideration, which are described below in this Note 9 under "valuation techniques":

	Contingent consideration
	2016
	(Dollars in thousands)
Balance - December 31, 2015	$	20,829
Payment	(133		)
Revaluations	1,672
Balance - September 25, 2016	$	22,368

Valuation Technique and Inputs Used to Determine Fair Value of Assets or Liabilities

The following table provides information regarding the valuation techniques and inputs used in determining the fair value of assets or liabilities categorized as Level 3 measurements as of September 25, 2016:

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Contingent consideration	Discounted cash flow	Discount rate	2.3% - 10% (8.4%)
Contingent consideration		Probability of payment	2% - 100% (71.3%)