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Earnings Per Share - Reconciliation of Shares Used in Basic and Diluted EPS Calculations (Details) 1
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3 Months Ended | |||||
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Mar. 31, 2015
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Mar. 31, 2014
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||||
| Weighted average number of shares used in computing basic EPS | 207,641,523 | 206,525,188 | ||||
| Add dilutive common stock equivalents: | ||||||
| Outstanding stock options and restricted stock units | 648,166 | [1] | 561,489 | [1] | ||
| Weighted average number of shares used in computing diluted EPS | 208,289,689 | 207,086,677 | ||||
| Anti-dilutive Stock Options and RSU [Member] | ||||||
| Add dilutive common stock equivalents: | ||||||
| Antidilutive securities excluded from computation of earnings per share, amount | 1,486,626 | 1,389,283 | ||||
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