| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | $ | (15,799 | ) | | $ | (9,273 | ) | | $ | (19,993 | ) | | $ | (6,708 | ) | | | | | | | | | | | | | | | | | | | Weighted-average common shares outstanding | | | 61,455 | | | | 60,534 | | | | 61,400 | | | | 60,476 | | Dilutive effect of stock options and restricted stock | | | - | | | | - | | | | - | | | | - | | Weighted average common and dilutive potential common shares outstanding | | | 61,455 | | | | 60,534 | | | | 61,400 | | | | 60,476 | | | | | | | | | | | | | | | | | | | | | | | $ | (0.26 | ) | | $ | (0.15 | ) | | $ | (0.33 | ) | | $ | (0.11 | ) | | | | $ | (0.26 | ) | | $ | (0.15 | ) | | $ | (0.33 | ) | | $ | (0.11 | ) | |
| Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | 2,574 | | | | 3,301 | | | | 2,694 | | | | 3,102 | | Restricted shares / Restricted share units | | | 964 | | | | 1,468 | | | | 857 | | | | 1,319 | | | | | | 3,538 | | | | 4,769 | | | | 3,551 | | | | 4,421 | | |