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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands | Total | Non-controlling interests subject to put provisions | Common stock | Common stock Restricted Stock Units (RSUs) | Common stock Stock appreciation rights | Additional paid-in capital | Additional paid-in capital Restricted Stock Units (RSUs) | Additional paid-in capital Stock appreciation rights | Retained earnings | Treasury stock | Treasury stock Restricted Stock Units (RSUs) | Treasury stock Stock appreciation rights | Accumulated other comprehensive income (loss) | Total | Total Restricted Stock Units (RSUs) | Total Stock appreciation rights | Non-controlling interests not subject to put provisions
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Temporary equity, beginning balance at Dec. 31, 2015 |  | $ 864,066 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 99,834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  | (111,092) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions |  | 33,517 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions and divestitures |  | 28,874 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partial purchases |  | (6,660) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value remeasurements |  | 65,855 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassifications of Temporary to Permanent Equity |  | (1,136) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,136
Temporary equity, ending balance at Dec. 31, 2016 |  | 973,258 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2015 |  |  | (217,120,000) |  |  |  |  |  |  | (7,366,000) |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2015 |  |  | $ 217 |  |  | $ 1,118,326 |  |  | $ 4,356,835 | $ (544,772) |  |  | $ (59,826) | $ 4,870,780 |  |  | 213,392
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 879,874 |  |  |  |  |  |  |  | 879,874 |  |  |  |  | 879,874 |  |  | 53,374
Comprehensive income | (29,627) |  |  |  |  |  |  |  |  |  |  |  | (29,817) | (29,817) |  |  | 190
Stock purchase shares issued (in shares) |  |  | 438,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase shares issued |  |  | $ 1 |  |  | 23,902 |  |  |  |  |  |  |  | 23,903 |  |  |
Stock-settled share based payment awards, shares issued (in shares) |  |  |  | 4,000 | 218,000 |  |  |  |  |  | 276,000 | 513,000 |  |  |  |  |
Stock-settled share based payment awards |  |  |  | $ 0 | $ 0 |  | $ 19,815 | $ 36,685 |  |  | $ 19,815 | $ 36,685 |  |  | $ 0 | $ 0 |
Stock-settled stock-based compensation expense |  |  |  |  |  | 37,970 |  |  |  |  |  |  |  | 37,970 |  |  |
Excess tax benefits from stock awards exercised |  |  |  |  |  | 13,251 |  |  |  |  |  |  |  | 13,251 |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (81,309)
Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,073
Acquisitions and divestitures |  |  |  |  |  | 3,423 |  |  |  |  |  |  |  | 3,423 |  |  |
Acquisitions and divestitures, noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,585
Partial purchases |  |  |  |  |  | (13,105) |  |  |  |  |  |  |  | (13,105) |  |  | (1,747)
Fair value remeasurements |  |  |  |  |  | (65,855) |  |  |  |  |  |  |  | (65,855) |  |  |
Reclassifications and expirations of puts |  | 1,136 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,136)
Purchase of treasury stock (in shares) |  |  |  |  |  |  |  |  |  | (16,649,000) |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | $ (1,072,377) |  |  |  | (1,072,377) |  |  |
Retirement of treasury stock (in shares) |  |  | (23,226,000) |  |  |  |  |  |  | (23,226,000) |  |  |  |  |  |  |
Retirement of treasury stock |  |  | $ (23) |  |  | (34,230) |  |  | (1,526,396) | $ 1,560,649 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 |  |  | $ 195 |  |  | 1,027,182 |  |  | 3,710,313 | $ 0 |  |  | (89,643) | 4,648,047 |  |  | 201,694
Ending balance (in shares) at Dec. 31, 2016 |  |  | (194,554,000) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 103,641 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  | (128,853) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions |  | 52,911 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions and divestitures |  | 43,799 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partial purchases |  | (397) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value remeasurements |  | (32,999) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity, ending balance at Dec. 31, 2017 |  | 1,011,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 663,618 |  |  |  |  |  |  |  | 663,618 |  |  |  |  | 663,618 |  |  | 63,296
Comprehensive income | $ 102,876 |  |  |  |  |  |  |  |  |  |  |  | 102,878 | 102,878 |  |  | (2)
Stock purchase shares issued (in shares) |  |  | 360,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase shares issued |  |  |  |  |  | 22,131 |  |  |  |  |  |  |  | 22,131 |  |  |
Stock-settled share based payment awards, shares issued (in shares) |  |  |  | 117,000 | 398,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock-settled share based payment awards |  |  |  |  |  |  | 101 | 0 |  |  |  |  |  |  | 101 | 0 |
Stock-settled stock-based compensation expense |  |  |  |  |  | 34,981 |  |  |  |  |  |  |  | 34,981 |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (82,614)
Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,641
Acquisitions and divestitures |  |  |  |  |  | (823) |  |  |  |  |  |  |  | (823) |  |  |
Acquisitions and divestitures, noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,770)
Partial purchases |  |  |  |  |  | (2,752) |  |  |  |  |  |  |  | (2,752) |  |  | (2,208)
Fair value remeasurements |  |  |  |  |  | 32,999 |  |  |  |  |  |  |  | 32,999 |  |  |
Purchase of treasury stock (in shares) | (12,966,672) |  |  |  |  |  |  |  |  | (12,967,000) |  |  |  |  |  |  |
Purchase of treasury stock | $ (810,949) |  |  |  |  |  |  |  |  | $ (810,949) |  |  |  | (810,949) |  |  |
Retirement of treasury stock (in shares) |  |  | (12,967,000) |  |  |  |  |  |  | (12,967,000) |  |  |  |  |  |  |
Retirement of treasury stock |  |  | $ (13) |  |  | (70,718) |  |  | (740,218) | $ 810,949 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | $ 4,886,066 |  | $ 182 |  |  | 1,042,899 |  |  | 3,633,713 | $ 0 |  |  | 13,235 | 4,690,029 |  |  | 196,037
Ending balance (in shares) at Dec. 31, 2017 | (182,462,278) |  | (182,462,000) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  | 8,368 |  |  |  | (8,368) | 0 |  |  |
Net income |  | 105,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  | (119,173) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions |  | 32,918 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions and divestitures |  | 79,078 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partial purchases |  | (8,546) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value remeasurements |  | 23,473 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity, ending balance at Dec. 31, 2018 |  | $ 1,124,641 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 159,394 |  |  |  |  |  |  |  | 159,394 |  |  |  |  | 159,394 |  |  | 68,115
Comprehensive income | $ (39,791) |  |  |  |  |  |  |  |  |  |  |  | (39,791) | (39,791) |  |  |
Stock purchase shares issued (in shares) |  |  | 398,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock purchase shares issued |  |  |  |  |  | 17,398 |  |  |  |  |  |  |  | 17,398 |  |  |
Stock-settled share based payment awards, shares issued (in shares) |  |  |  | 158,000 | 213,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock-settled share based payment awards |  |  |  |  | $ 1 |  | $ 448 | $ 4,887 |  |  |  |  |  |  | $ 448 | $ 4,886 |
Stock-settled stock-based compensation expense |  |  |  |  |  | 73,081 |  |  |  |  |  |  |  | 73,081 |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (77,268)
Contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,393
Acquisitions and divestitures |  |  |  |  |  | 3,546 |  |  |  |  |  |  |  | 3,546 |  |  |
Acquisitions and divestitures, noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 318
Partial purchases |  |  |  |  |  | (17,897) |  |  |  |  |  |  |  | (17,897) |  |  | (1,639)
Fair value remeasurements |  |  |  |  |  | (23,473) |  |  |  |  |  |  |  | (23,473) |  |  |
Purchase of treasury stock (in shares) | (16,844,067) |  |  |  |  |  |  |  |  | (16,844,000) |  |  |  |  |  |  |
Purchase of treasury stock | $ (1,153,511) |  |  |  |  |  |  |  |  | $ (1,153,511) |  |  |  | (1,153,511) |  |  |
Retirement of treasury stock (in shares) |  |  | (16,844,000) |  |  |  |  |  |  | (16,844,000) |  |  |  |  |  |  |
Retirement of treasury stock |  |  | $ (17) |  |  | (95,213) |  |  | (1,058,281) | $ 1,153,511 |  |  |  | 0 |  |  |
Ending balance at Dec. 31, 2018 | $ 3,908,398 |  | $ 166 |  |  | $ 995,006 |  |  | $ 2,743,194 | $ 0 |  |  | $ (34,924) | $ 3,703,442 |  |  | $ 204,956
Ending balance (in shares) at Dec. 31, 2018 | (166,387,307) |  | (166,387,000) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |

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