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Financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
After Tax Gain/(Loss) Recognized in OCI | The following table provides information as to the gains and losses attributable to derivatives in cash flow hedging relationships that were reported in other comprehensive income (“OCI”) for the years ended December 31, 2014, 2013 and 2012:
| After Tax Gain/(Loss) Recognized in OCI
| 2014 |  | 2013 |  | 2012
| (Dollars in thousands)
Interest rate swap | $ | — |  |  | $ | — |  |  | $ | 7,032 |
Foreign currency exchange contracts | — |  |  | 381 |  |  | (156 | )
Total | $ | — |  |  | $ | 381 |  |  | $ | 6,876 |
Aggregate Accounts Receivable, Net of Allowance for Doubtful Accounts | The aggregate net current and long-term accounts receivable for customers in Spain, Italy, Greece and Portugal and the percentage of the Company’s total net current and long-term accounts receivable represented by the net current and long-term accounts receivables for customers in those countries at December 31, 2014 and 2013 are as follows:
| December 31, 2014 |  | December 31, 2013
| (Dollars in thousands)
Current and long-term accounts receivable (net of allowances of $8.1 million and $7.9 million in 2014 and 2013, respectively) in Spain, Italy, Greece and Portugal (1) | $ | 76,190 |  |  | $ | 97,852 |
Percentage of total net current and long-term accounts receivables | 27.3 | % |  | 31.0 | %
(1) The long-term portion of accounts receivable, net from customers in Spain, Italy, Greece and Portugal at December 31, 2014 and 2013 was $11.3 million and $17.6 million, respectively, and is reported in other assets.

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 + Details
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- Definition Tabular disclosure of the effective portion of the gains and losses on derivative instruments designated (and non-derivative instruments) designated and qualifying in cash flow hedges and net investment hedges that was recognized in other comprehensive income (loss) during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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