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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 |  | 55,243 |  |  |  |  |  |  | 150,816 |  |  |  |  | 150,816 | 26,603
Other comprehensive income (loss) | $ (61) |  |  |  |  |  |  |  |  |  |  |  | (210) | (210) | 149
Stock unit shares issued |  |  |  |  |  |  | $ (19,267) | $ (25,388) |  |  | $ 19,267 | $ 25,388 |  |  |
Stock unit shares issued (in shares) |  |  |  |  | 219,000 |  |  |  |  |  | 268,000 | 353,000 |  |  |
Stock-settled stock-based compensation expense |  |  |  |  |  | 23,196 |  |  |  |  |  |  |  | 23,196 |
Excess tax benefits from stock awards exercised |  |  |  |  |  | 10,604 |  |  |  |  |  |  |  | 10,604 |
Distributions to noncontrolling interests |  | (54,413) |  |  |  |  |  |  |  |  |  |  |  |  | (39,740)
Contributions from noncontrolling interests |  | 9,049 |  |  |  |  |  |  |  |  |  |  |  |  | 4,068
Sales and assumptions of additional noncontrolling interests |  | 7,837 |  |  |  |  |  |  |  |  |  |  |  |  | 9,887
Purchase of noncontrolling interests |  |  |  |  |  | (4,530) |  |  |  |  |  |  |  | (4,530) | (1,710)
Changes in fair value of noncontrolling interests |  | 55,121 |  |  |  | (55,121) |  |  |  |  |  |  |  | (55,121) |
Purchase of treasury stock | $ (249,481) |  |  |  |  |  |  |  |  | $ (249,481) |  |  |  | (249,481) |
Purchase of treasury stock (in shares) | (3,690,000) |  |  |  |  |  |  |  |  | (3,690,000) |  |  |  |  |
Ending Balance at Jun. 30, 2016 | $ 4,958,703 | $ 936,903 | $ 217 |  |  | $ 1,047,820 |  |  | $ 4,507,651 | $ (749,598) |  |  | $ (60,036) | $ 4,746,054 | $ 212,649
Ending Balance (in shares) at Jun. 30, 2016 | 206,904,375 |  | 217,339,000 |  |  |  |  |  |  | (10,435,000) |  |  |  |  |

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