Fair value measurement (Tables)

6 Months Ended

Jun. 28, 2015

Fair Value Disclosures [Abstract]

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

The following tables provide information regarding the financial assets and liabilities measured at fair value on a recurring basis as of June 28, 2015 and December 31, 2014:

	Total carrying value at June 28, 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	$	6,960	$	6,960	$	—	$	—
Derivative assets	419		—		419		—
Derivative liabilities	1,808		—		1,808		—
Contingent consideration liabilities	27,150		—		—		27,150

	Total carrying value at December 31, 2014		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	$	6,863	$	6,863	$	—	$	—
Contingent consideration liabilities	33,433		—		—		33,433

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

The following table provides information regarding changes, during the six months ended June 28, 2015, in Level 3 financial liabilities related to contingent consideration in connection with various Company acquisitions:

	Contingent consideration
	2015
	(Dollars in thousands)
Balance - December 31, 2014	$	33,433
Payment	(4,000		)
Revaluations	(2,283		)
Balance - June 28, 2015	$	27,150

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 June 28, 2015:

	Valuation Technique	Unobservable Input	Range (Weighted Average)
Contingent consideration	Discounted cash flow	Discount rate	1.6% - 10% (7.7%)
		Probability of payment	0% - 100% (57.3%)