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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to common stockholders, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 177,038 | $ 234,162 | $ 170,283
Income from continuing operations — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 177,081 | 234,212 | 170,334
Net income attributable to common stockholders | $ 66,246 |  | $ 47,727 |  | $ 15,620 |  | $ 47,445 |  | $ 72,354 |  | $ 47,448 |  | $ 52,595 |  | $ 61,375 |  | 177,038 | 233,772 | 172,469
After tax interest on convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43 | 50 | 51
Income from discontinued operations, net |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ (390) |  | $ 0 |  | 0 | (390) | 2,186
Net income — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 177,081 | $ 233,822 | $ 172,520
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares — basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 193,086 | 200,356 | 210,741
Convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121 | 121 | 121
Weighted average shares — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 196,042 | 204,450 | 214,200
Net income attributable to common stockholders, basic | $ 0.35 | [1] | $ 0.25 | [1] | $ 0.08 | [1] | $ 0.24 | [1] | $ 0.37 | [1] | $ 0.24 | [1] | $ 0.26 | [1] | $ 0.30 | [1] | $ 0.92 | $ 1.17 | $ 0.82
Net income attributable to common stockholders, diluted | $ 0.34 | [1] | $ 0.24 | [1] | $ 0.08 | [1] | $ 0.24 | [1] | $ 0.36 | [1] | $ 0.23 | [1] | $ 0.25 | [1] | $ 0.30 | [1] | 0.90 | 1.14 | 0.81
Income from continuing operations attributable to common stockholders, per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.17 | 0.81
Income from continuing operations attributable to common stockholders, per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.14 | 0.80
Income from discontinued operations per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0 | 0.01
Income from discontinued operations per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0 | $ 0.01
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 982,000 | 3,000 | 1,491,000
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,823 | 3,973 | 3,338
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 0 | 0
[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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