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Interest expense (Tables) | 12 Months Ended
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Dec. 31, 2013
Interest Expense [Abstract] |
Schedule of interest expense |
Year ended December 31, |  | 2013 |  |  | 2012 |
Interest on capital lease obligations |  | $ | 2,716 |  |  | $ | 1,326 |
Amortization of deferred financing costs |  | 4,326 |  |  | 1,623 |
Interest on credit facilities |  | 2,424 |  |  | 4,759 |
Interest on Series 1 Debentures |  | 12,507 |  |  | 15,208 |
Interest on long term debt |  | $ | 21,973 |  |  | $ | 22,916 |
Other interest (income) expense |  | (276 | ) |  | 624 |
|  | $ | 21,697 |  |  | $ | 23,540 |

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