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Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |
Net loss | $ (9,507) |  | $ (12,023) |  | $ (30,638) |  | $ (28,701) |
Amount allocated to common shareholders (in hundredths) | 100.00% | [1] | 100.00% | [1] | 100.00% |  | 100.00% |
Basic EPS: |  |  |  |  |  |  |  |
Net loss allocated to common shareholders | (9,507) |  | (12,023) |  | (30,638) |  | (28,701) |
Net loss allocable to common shareholders - (in Shares) | 88,611,000 |  | 88,468,000 |  | 88,588,000 |  | 88,549,000 |
Earnings Per Share, Basic | $ (0.11) |  | $ (0.14) |  | $ (0.35) |  | $ (0.32) |
Diluted EPS: |  |  |  |  |  |  |  |
Net loss applicable to common shareholders with assumed conversion | $ (9,507) |  | $ (12,023) |  | $ (30,638) |  | $ (28,701) |
Net loss applicable to common shareholders with assumed conversion - (in Shares) | 88,611,000 |  | 88,468,000 |  | 88,588,000 |  | 88,549,000 |
Earnings Per Share, Diluted | $ (0.11) |  | $ (0.14) |  | $ (0.35) |  | $ (0.32) |
Stock Options [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from calculation of diluted EPS (in shares) | 620,334 | [2] | 626,334 | [2] | 620,334 | [2] | 626,334 | [2]
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from calculation of diluted EPS (in shares) | 573,628 | [2] | 406,070 | [2] | 522,032 | [2] | 382,462 | [2]
[1] | We have not allocated net losses between common and preferred shareholders, as the holders of our preferred shares do not have a contractual obligation to share in the loss.
[2] | In periods when we report a net loss, all share awards are excluded from the calculation of diluted weighted average stock outstanding because of their antidilutive effect on earnings (loss) per share.

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