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Earnings per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | A reconciliation of the numerator (net income) and denominator (weighted average number of shares outstanding of the basic and diluted earnings per share ("EPS")) for the three months and six months ended June 30, 2013 and June 30, 2012 is as follows (in thousands, except per share data):
| Three months ended June 30, 2013
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 19,138 |  |  | 84,789 |  |  | $ | 0.23 |
Effect of restricted stock | — |  |  | 250 |  |  |
Diluted EPS | $ | 19,138 |  |  | 85,039 |  |  | $ | 0.23 |
| Three months ended June 30, 2012
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 18,227 |  |  | 86,451 |  |  | $ | 0.21 |
Effect of restricted stock | — |  |  | 328 |  |  |
Diluted EPS | $ | 18,227 |  |  | 86,779 |  |  | $ | 0.21 |
| Six months ended June, 2013
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | 38,874 |  |  | 84,780 |  |  | 0.46 |
Effect of restricted stock | — |  |  | 262 |  |  |
Diluted EPS | $ | 38,874 |  |  | 85,042 |  |  | $ | 0.46 |
| Six months ended June, 2012
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 34,816 |  |  | 86,463 |  |  | $ | 0.40 |
Effect of restricted stock | — |  |  | 339 |  |  |
Diluted EPS | $ | 34,816 |  |  | 86,802 |  |  | $ | 0.40 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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