Financial instruments (Tables)

12 Months Ended

Dec. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the locations in the consolidated balance sheet and fair value of derivative instruments as of December 31, 2016 and 2015:



	December 31, 2016		December 31, 2015
	Fair Value
	(Dollars in thousands)
Asset derivatives:
Designated foreign currency forward contracts	$	667	$	285
Non-designated foreign currency forward contracts	490		44
Prepaid expenses and other current assets	1,157		329
Total asset derivatives	1,157		329
Liability derivatives:
Designated foreign currency forward contracts	2,139		807
Non-designated foreign currency forward contracts	118		491
Other current liabilities	2,257		1,298
Total liability derivatives	$	2,257	$	1,298

After Tax Gain/(Loss) Recognized in OCI

The following table provides information as to the gains and losses attributable to derivatives that were designated as cash flow hedges and reported in other comprehensive income (loss) (“OCI”) for the years ended December 31, 2016, 2015 and 2014:



	After Tax Gain (Loss) Recognized in OCI
	2016		2015			2014
	(Dollars in thousands)
Foreign currency exchange contracts	$	67	$	(2,491	)	$	—

Aggregate Accounts Receivable, Net of Allowance for Doubtful Accounts

The aggregate net current and long-term trade accounts receivable for customers in Greece, Italy, Spain and Portugal and the percentage of the Company’s total net current and long-term trade accounts receivable represented by the net current and long-term trade accounts receivable for customers in those countries at December 31, 2016 and 2015 are as follows:



	December 31, 2016			December 31, 2015
	(Dollars in thousands)
Current and long-term trade accounts receivable (net of allowances of $7.7 million and $7.2 million in 2016 and 2015, respectively) in Greece, Italy, Spain and Portugal ⁽¹⁾	$	51,098		$	62,272
Percentage of total net current and long-term trade accounts receivables	19.3		%	23.9		%

(1) The long-term portion of trade accounts receivable, net from customers in Greece, Italy, Spain and Portugal at December 31, 2016 and 2015 was $2.7 million and $8.1 million, respectively. In January 2017, the Company sold $16.1 million of receivables outstanding with publicly funded hospitals in Italy for $16.0 million.