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Fair value measurements (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Recorded at Fair Value on Recurring Basis | The fair value of the Company’s financial assets and liabilities on a recurring basis were as follows:
(U.S. Dollars in thousands) |  | Balance March 31, 2014 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  | (Restated1) |  |  |  |  |
Collective trust funds |  | $ | 1,652 |  |  | $ | — |  |  | $ | 1,652 |  |  | $ | — |
Treasury securities |  |  | 661 |  |  |  | 661 |  |  |  | — |  |  |  | — |
Certificates of deposit |  |  | 1,630 |  |  |  | 1,630 |  |  |  | — |  |  |  | — |
Derivative securities |  |  | 107 |  |  |  | — |  |  |  | 107 |  |  |  | — |
Total |  | $ | 4,050 |  |  | $ | 2,291 |  |  | $ | 1,759 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan |  | $ | (1,970 | ) |  | $ | — |  |  | $ | (1,970 | ) |  | $ | — |
Derivative securities |  |  | (1,035 | ) |  |  | — |  |  |  | (1,035 | ) |  |  | — |
Total |  | $ | (3,005 | ) |  | $ | — |  |  | $ | (3,005 | ) |  | $ | — |
(U.S. Dollars in thousands) |  | Balance December 31, 2013 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  | (Restated1) |  |  |  |  |
Collective trust funds |  | $ | 1,667 |  |  | $ | — |  |  | $ | 1,667 |  |  | $ | — |
Treasury securities |  |  | 660 |  |  |  | 660 |  |  |  | — |  |  |  | — |
Certificates of deposit |  |  | 1,562 |  |  |  | 1,562 |  |  |  | — |  |  |  | — |
Derivative securities |  |  | 107 |  |  |  | — |  |  |  | 107 |  |  |  | — |
Total |  | $ | 3,996 |  |  | $ | 2,222 |  |  | $ | 1,774 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan |  | $ | (2,506 | ) |  | $ | — |  |  | $ | (2,506 | ) |  | $ | — |
Derivative securities |  |  | (1,036 | ) |  |  | — |  |  |  | (1,036 | ) |  |  | — |
Total |  | $ | (3,542 | ) |  | $ | — |  |  | $ | (3,542 | ) |  | $ | — |
(1) | The Company has changed the presentation to breakout and provide more description of assets and to include financial instruments not previously included in the table above.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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