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Earnings Per Share Level 4 (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to common stockholders, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 234,162 | $ 170,283 | $ 146,926
Income from continuing operations — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 234,212 | 170,334 | 146,977
Net income attributable to common stockholders | $ 72,354 |  | $ 47,448 |  | $ 52,595 |  | $ 61,375 |  | $ 87,794 |  | $ 17,651 |  | $ 25,922 |  | $ 41,102 |  | 233,772 | 172,469 | 147,332
After tax interest on convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 | 51 | 51
Income from discontinued operations, net | $ 0 |  | $ 0 |  | $ (390) |  | $ 0 |  | $ 1,340 |  | $ 884 |  | $ (178) |  | $ 140 |  | (390) | 2,186 | 406
Net income — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 233,822 | $ 172,520 | $ 147,383
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares — basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,356 | 210,741 | 211,811
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,973 | 3,338 | 4,082
Convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121 | 121 | 121
Weighted average shares — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 204,450 | 214,200 | 216,014
Net income attributable to common stockholders, basic | $ 0.37 | [1] | $ 0.24 | [1] | $ 0.26 | [1] | $ 0.30 | [1] | $ 0.42 | [1] | $ 0.08 | [1] | $ 0.12 | [1] | $ 0.19 | [1] | $ 1.17 | $ 0.82 | $ 0.70
Net income attributable to common stockholders, diluted | $ 0.36 | [1] | $ 0.23 | [1] | $ 0.25 | [1] | $ 0.30 | [1] | $ 0.42 | [1] | $ 0.08 | [1] | $ 0.12 | [1] | $ 0.19 | [1] | 1.14 | 0.81 | 0.68
Income from continuing operations attributable to common stockholders, per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.81 | 0.70
Income from continuing operations attributable to common stockholders, per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.80 | 0.68
Income from discontinued operations per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.01 | 0
Income from discontinued operations per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.01 | $ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 1,500 | 1,200
[1] | Net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarters’ net income per share may not equal the total computed for the year.

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