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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net Income (Loss) Attributable to Parent [Abstract]                      
Net income attributable to common stockholders $ 147,152 $ 70,792 $ 72,329 $ 79,323 $ 193,046 $ 68,935 $ 103,239 $ 81,988 $ 369,596 $ 447,208 $ 546,663
After tax interest on convertible debt                 0 0 52
Net income — diluted                 $ 369,596 $ 447,208 $ 546,715
Weighted average shares (denominator):                      
Weighted average shares — basic                 182,246 182,447 187,630
Convertible debt                 0 0 121
Weighted average shares — diluted                 185,523 186,972 192,246
Net income attributable to common stockholders, basic $ 0.81 [1] $ 0.39 [1] $ 0.40 [1] $ 0.44 [1] $ 1.07 [1] $ 0.38 [1] $ 0.57 [1] $ 0.44 [1] $ 2.03 $ 2.45 $ 2.91
Net income attributable to common stockholders, diluted $ 0.79 [1] $ 0.38 [1] $ 0.39 [1] $ 0.43 [1] $ 1.04 [1] $ 0.37 [1] $ 0.55 [1] $ 0.43 [1] $ 1.99 $ 2.39 $ 2.84
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 678,000 1,035,000 911,000
Stock Options [Member]                      
Weighted average shares (denominator):                      
Share based compensation                 3,223 4,339 4,396
Restricted Stock Units (RSUs) [Member]                      
Weighted average shares (denominator):                      
Share based compensation                 54 186 99
[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.