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CONSOLIDATED STATEMENTS OF EQUITY (unaudited) - USD ($) $ in Thousands | Total | Non- controlling Interests subject to put provisions | Common stock | Common stock Restricted Stock Units | Common stock Stock Appreciation Rights | Additional paid-in capital | Additional paid-in capital Restricted Stock Units | Additional paid-in capital Stock Appreciation Rights | Retained earnings | Treasury stock | Treasury stock Restricted Stock Units | Treasury stock Stock Appreciation Rights | Accumulated other comprehensive(loss) | Total | Non-controlling interests not subject to put provisions
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 |  | $ 829,965 | $ 216 |  |  | $ 1,108,211 |  |  | $ 4,087,103 |  |  |  | $ (25,017) | $ 5,170,513 | $ 189,798
Beginning Balance (in shares) at Dec. 31, 2014 |  |  | 215,641,000 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 96,510 |  |  |  |  |  |  | 269,732 |  |  |  |  | 269,732 | 61,168
Other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (34,809) | (34,809) |
Stock purchase shares issued |  |  |  |  |  | (6,079) |  |  |  | $ 30,608 |  |  |  | 24,529 |
Stock purchase shares issued (in shares) |  |  |  |  |  |  |  |  |  | 414,000 |  |  |  |  |
Stock unit shares issued |  |  |  |  | $ 1 |  |  | $ (1) |  |  |  |  |  |  |
Stock unit shares issued (in shares) |  |  |  | 348,000 | 1,131,000 |  |  |  |  |  |  |  |  |  |
Stock-settled stock-based compensation expense |  |  |  |  |  | 56,899 |  |  |  |  |  |  |  | 56,899 |
Excess tax benefits from stock awards exercised |  |  |  |  |  | 28,157 |  |  |  |  |  |  |  | 28,157 |
Distributions to noncontrolling interests |  | (103,355) |  |  |  |  |  |  |  |  |  |  |  |  | (71,280)
Contributions from noncontrolling interests |  | 25,795 |  |  |  |  |  |  |  |  |  |  |  |  | 28,849
Sales and assumptions of additional noncontrolling interests |  | 10,654 |  |  |  |  |  |  |  |  |  |  |  |  | 6,875
Purchase of noncontrolling interests |  | (8,538) |  |  |  | (55,826) |  |  |  |  |  |  |  | (55,826) | (2,018)
Changes in fair value of noncontrolling interests |  | 13,035 |  |  |  | (13,035) |  |  |  |  |  |  |  | (13,035) |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | $ (575,380) |  |  |  | (575,380) |
Purchase of treasury stock (in shares) |  |  |  |  |  |  |  |  |  | (7,780,000) |  |  |  |  |
Ending Balance at Dec. 31, 2015 | $ 5,084,172 | 864,066 | $ 217 |  |  | 1,118,326 |  |  | 4,356,835 | $ (544,772) |  |  | (59,826) | 4,870,780 | 213,392
Ending Balance (in shares) at Dec. 31, 2015 | 209,754,247 |  | 217,120,000 |  |  |  |  |  |  | (7,366,000) |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 78,770 |  |  |  |  |  |  | 722,148 |  |  |  |  | 722,148 | 43,894
Other comprehensive income (loss) | $ 7,807 |  |  |  |  |  |  |  |  |  |  |  | 7,600 | 7,600 | 207
Stock unit shares issued |  |  |  |  |  |  | $ (19,815) | $ (33,077) |  |  | $ 19,815 | $ 33,077 |  |  |
Stock unit shares issued (in shares) |  |  |  |  | 219,000 |  |  |  |  |  | 276,000 | 460,000 |  |  |
Stock-settled stock-based compensation expense |  |  |  |  |  | 29,336 |  |  |  |  |  |  |  | 29,336 |
Excess tax benefits from stock awards exercised |  |  |  |  |  | 12,584 |  |  |  |  |  |  |  | 12,584 |
Distributions to noncontrolling interests |  | (85,337) |  |  |  |  |  |  |  |  |  |  |  |  | (59,735)
Contributions from noncontrolling interests |  | 26,552 |  |  |  |  |  |  |  |  |  |  |  |  | 8,972
Sales and assumptions of additional noncontrolling interests |  | 17,712 |  |  |  | 3,423 |  |  |  |  |  |  |  | 3,423 | 2,585
Purchase of noncontrolling interests |  | (2,922) |  |  |  | (5,135) |  |  |  |  |  |  |  | (5,135) | (1,670)
Changes in fair value of noncontrolling interests |  | 72,903 |  |  |  | (72,903) |  |  |  |  |  |  |  | (72,903) |
Purchase of treasury stock | $ (656,087) |  |  |  |  |  |  |  |  | $ (656,087) |  |  |  | (656,087) |
Purchase of treasury stock (in shares) | (9,930,000) |  |  |  |  |  |  |  |  | (9,930,000) |  |  |  |  |
Ending Balance at Sep. 30, 2016 | $ 5,119,391 | $ 971,744 | $ 217 |  |  | $ 1,032,739 |  |  | $ 5,078,983 | $ (1,147,967) |  |  | $ (52,226) | $ 4,911,746 | $ 207,645
Ending Balance (in shares) at Sep. 30, 2016 | 200,778,434 |  | 217,339,000 |  |  |  |  |  |  | (16,560,000) |  |  |  |  |

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