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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Reconciliation Between Basic And Diluted Weighted Average Shares Outstanding |
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Basic weighted average shares outstanding | 71,650,000 |  |  | 70,506,000 |  |  | 71,504,000 |  |  | 70,286,000 |
Effect of dilution: |  |  |  |  |  |  |
Stock options | 263,000 |  |  | 821,000 |  |  | 297,000 |  |  | 847,000 |
Restricted shares/units | 842,000 |  |  | 938,000 |  |  | 859,000 |  |  | 1,061,000 |
Diluted weighted average shares outstanding | 72,755,000 |  |  | 72,265,000 |  |  | 72,660,000 |  |  | 72,194,000 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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