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Commitments and contingencies (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2013
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Future Minimum Payments for Operating Leases | Future minimum lease payments at December 31, 2013, under operating leases with initial or remaining terms in excess of one year were as follows (dollars in thousands):
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