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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
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Income (Loss) Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to common stockholders, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 546,663 | $ 177,038 | $ 234,162
Income from continuing operations — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 546,715 | 177,081 | 234,212
Net income attributable to common stockholders | $ 247,316 |  | $ 56,164 |  | $ 68,481 |  | $ 174,702 |  | $ 66,246 |  | $ 47,727 |  | $ 15,620 |  | $ 47,445 |  | 546,663 | 177,038 | 233,772
After tax interest on convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 52 | 43 | 50
Income from discontinued operations, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (390)
Net income — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 546,715 | $ 177,081 | $ 233,822
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares — basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 187,630 | 193,086 | 200,356
Convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 121 | 121 | 121
Weighted average shares — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,246 | 196,042 | 204,450
Net income attributable to common stockholders, basic | $ 1.32 | [1] | $ 0.30 | [1] | $ 0.37 | [1] | $ 0.93 | [1] | $ 0.35 | [1] | $ 0.25 | [1] | $ 0.08 | [1] | $ 0.24 | [1] | $ 2.91 | $ 0.92 | $ 1.17
Net income attributable to common stockholders, diluted | $ 1.29 | [1] | $ 0.29 | [1] | $ 0.36 | [1] | $ 0.91 | [1] | $ 0.34 | [1] | $ 0.24 | [1] | $ 0.08 | [1] | $ 0.24 | [1] | $ 2.84 | 0.90 | 1.14
Income from continuing operations attributable to common stockholders, per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.92 | 1.17
Income from continuing operations attributable to common stockholders, per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.90 | $ 1.14
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 911,000 | 982,000 | 3,000
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,396 | 2,823 | 3,973
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares (denominator): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99 | 12 | 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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- Definition Amount of income (loss) from continuing operations attributable to the parent plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References No definition available. + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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