| Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
The calculation of the basic and diluted net income per share was as follows: | | | | | | | | | | | | | | | | | | Three Months Ended
June 30, | | Six Months Ended
June 30, | (In thousands, except share and per share amounts) | 2016 | | 2015 | | 2016 | | 2015 | Net income from continuing operations: | | | | | | | | Net income from continuing operations - basic | $ | 98,112 |
| | $ | 45,193 |
| | $ | 164,361 |
| | $ | 136,920 |
| Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1) | 913 |
| | 3,707 |
| | 4,303 |
| | 7,380 |
| Net income from continuing operations - diluted | $ | 99,025 |
| | $ | 48,900 |
| | $ | 168,664 |
| | $ | 144,300 |
| | | | | | | | | Net income: | | | | | | | | Net income from continuing operations - basic | $ | 98,112 |
| | $ | 45,193 |
| | $ | 164,361 |
| | $ | 136,920 |
| Income (loss) from discontinued operations, net of tax | — |
| | 4,855 |
| | — |
| | 5,385 |
| Net income - basic | 98,112 |
| | 50,048 |
|
| 164,361 |
|
| 142,305 |
| Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1) | 913 |
| | 3,707 |
| | 4,303 |
| | 7,380 |
| Net income - diluted | $ | 99,025 |
| | $ | 53,755 |
|
| $ | 168,664 |
|
| $ | 149,685 |
| | | | | | | | | Average common shares outstanding - basic | 214,274 |
| | 193,112 |
| | 208,991 |
| | 192,245 |
| Dilutive effect of Convertible Senior Notes due 2017 (2) | 12 |
| | 12,438 |
| | — |
| | 11,789 |
| Dilutive effect of Convertible Senior Notes due 2019 | 8,928 |
| | 37,736 |
| | 21,256 |
| | 37,736 |
| Dilutive effect of stock-based compensation arrangements (2) | 2,989 |
| | 3,364 |
| | 2,698 |
| | 3,211 |
| Adjusted average common shares outstanding - diluted | 226,203 |
|
| 246,650 |
| | 232,945 |
| | 244,981 |
| | | | | | | | | Net income per share: | | | | | | | | | | | | | | | | Basic: | | | | | | | | Net income from continuing operations | $ | 0.46 |
| | $ | 0.23 |
| | $ | 0.79 |
| | $ | 0.71 |
| Income (loss) from discontinued operations | — |
| | 0.03 |
| | — |
| | 0.03 |
| Net income | $ | 0.46 |
| | $ | 0.26 |
| | $ | 0.79 |
| | $ | 0.74 |
| | | | | | | | | Diluted: | | | | | | | | Net income from continuing operations | $ | 0.44 |
| | $ | 0.20 |
| | $ | 0.73 |
| | $ | 0.59 |
| Income (loss) from discontinued operations | — |
| | 0.02 |
| | — |
| | 0.02 |
| Net income | $ | 0.44 |
| | $ | 0.22 |
| | $ | 0.73 |
| | $ | 0.61 |
|
______________________ | | (1) | As applicable, includes coupon interest, amortization of discount and fees, and other changes in income or loss that would result from the assumed conversion. |
| | (2) | The following number of shares of our common stock equivalents issued under our stock-based compensation arrangements and convertible debt were not included in the calculation of net income per share because they were anti-dilutive: |
| | | | | | | | | | | | | | Three Months Ended
June 30, | | Six Months Ended
June 30, | (in thousands) | 2016 | | 2015 | | 2016 | | 2015 | Shares of common stock equivalents | 1,042 |
| | 264 |
| | 1,042 |
| | 530 |
| Shares of Convertible Senior Notes due 2017 | — |
| | — |
| | 1,902 |
| | — |
|
|