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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Common stock Class B Common Stock | Additional paid-in capital | Treasury stock | Retained earnings (deficit) | Accumulated other comprehensive income (loss) | Non-redeemable non-controlling interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2014 |  | 196,802,236 | 12,799,999 |  | 82,535,396 |  |  |
Beginning Balance at Dec. 31, 2014 | $ 1,893,729 | $ 20 | $ 1 | $ 5,921,140 | $ (3,998,120) | $ 0 | $ (138,774) | $ 109,462
Net income (excludes net income (loss) attributable to redeemable non-controlling interest) | 738,165 |  |  |  |  | 764,465 |  | (26,300)
Other comprehensive income (loss), net of taxes | (145,479) |  |  |  |  |  | (146,120) | 641
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares) |  | 3,385,749 |  |  |  |  |  |
Proceeds from exercise of equity instruments and employee stock purchase plans | 96,534 | $ 0 |  | 96,534 |  |  |  |
Withholding taxes for stock options | (85,033) |  |  | (85,033) |  |  |  |
Tax benefits on equity awards | 89,128 |  |  | 89,128 |  |  |  |
Issuance of common stock in connection with acquisitions (in shares) |  | 20,195,139 |  |  |  |  |  |
Issuance of common stock in connection with acquisitions | 2,552,342 | $ 2 |  | 2,552,340 |  |  |  |
Treasury stock activity related to vesting of equity instruments (in shares) |  |  |  |  | 127,712 |  |  |
Treasury stock activity related to vesting of equity instruments | $ (15,763) |  |  |  | $ (15,763) |  |  |
Common stock repurchases (in shares) | 525,504 |  |  |  | 525,504 |  |  |
Common stock repurchases | $ (44,822) |  |  |  | $ (44,822) |  |  |
Proceeds from issuance of treasury stock (in shares) |  |  |  |  | (264,841) |  |  |
Proceeds from issuance of treasury stock | 22,575 |  |  | 18,779 | $ 3,796 |  |  |
Cash dividends | (108,778) |  |  | 0 |  | (108,778) |  |
Adjustment to the fair value of redeemable non-controlling interests | (188,579) |  |  | (40,558) |  | (148,021) |  |
Change in ownership of non-controlling interest related to trivago initial public offering (IPO) |  |  |  | 0 |  |  |  |
Other changes in non-controlling interests | 5,807 |  |  | (4,198) |  |  |  | 10,005
Sale of controlling interest in eLong | (92,550) |  |  | 4,198 |  |  |  | (92,550)
Acquisition of non-controlling interest | 64,115 |  |  | 0 |  |  |  | 64,115
Stock-based compensation expense | 147,988 |  |  | 147,988 |  |  |  |
Other | 388 |  |  | 388 |  |  |  |
Ending Balance (in shares) at Dec. 31, 2015 |  | 220,383,124 | 12,799,999 |  | 82,923,771 |  |  |
Ending Balance at Dec. 31, 2015 | 4,929,767 | $ 22 | $ 1 | 8,696,508 | $ (4,054,909) | 507,666 | (284,894) | 65,373
Net income (excludes net income (loss) attributable to redeemable non-controlling interest) | 283,571 |  |  |  |  | 281,848 |  | 1,723
Other comprehensive income (loss), net of taxes | (1,551) |  |  |  |  |  | (1,551) | 0
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares) |  | 3,413,505 |  |  |  |  |  |
Proceeds from exercise of equity instruments and employee stock purchase plans | 141,043 | $ 0 |  | 141,043 |  |  |  |
Withholding taxes for stock options | (1,282) |  |  | (1,282) |  |  |  |
Issuance of common stock in connection with acquisitions (in shares) |  | 513,140 |  |  |  |  |  |
Issuance of common stock in connection with acquisitions | 0 | $ 0 |  | 0 |  |  |  |
Treasury stock activity related to vesting of equity instruments (in shares) |  |  |  |  | 174,378 |  |  |
Treasury stock activity related to vesting of equity instruments | $ (19,377) |  |  |  | $ (19,377) |  |  |
Common stock repurchases (in shares) | 3,979,170 |  |  |  | 3,979,170 |  |  |
Common stock repurchases | $ (436,369) |  |  |  | $ (436,369) |  |  |
Cash dividends | (149,906) |  |  | 0 |  | (149,906) |  |
Adjustment to the fair value of redeemable non-controlling interests | (847,601) |  |  | (344,064) |  | (503,537) |  |
Change in ownership of non-controlling interest related to trivago initial public offering (IPO) | 0 |  |  | 32,141 |  |  | 6,046 | 26,095
Transfer from redeemable non-controlling interests | 1,380,976 |  |  | 0 |  |  |  | 1,380,976
Proceeds related to trivago IPO, net of fees and expenses | 209,903 |  |  | 124,616 |  |  |  | 85,287
Other changes in non-controlling interests | 274 |  |  | (32,141) |  |  |  | 274
Sale of controlling interest in eLong |  |  |  | 0 |  |  |  |
Stock-based compensation expense | 196,358 |  |  | 196,358 |  |  |  |
Other | 4,286 |  |  | 3,212 |  |  |  | 1,074
Ending Balance (in shares) at Dec. 31, 2016 |  | 224,309,769 | 12,799,999 |  | 87,077,319 |  |  |
Ending Balance at Dec. 31, 2016 | 5,693,103 | $ 22 | $ 1 | 8,794,298 | $ (4,510,655) | 129,034 | (280,399) | 1,560,802
Impact of adoption of new accounting guidance related to stock-based compensation | 3,011 |  |  | 10,048 |  | (7,037) |  |
Net income (excludes net income (loss) attributable to redeemable non-controlling interest) | 368,824 |  |  |  |  | 377,964 |  | (9,140)
Other comprehensive income (loss), net of taxes | 182,875 |  |  |  |  |  | 131,466 | 51,409
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares) |  | 3,982,546 |  |  |  |  |  |
Proceeds from exercise of equity instruments and employee stock purchase plans | 228,189 | $ 1 |  | 228,188 |  |  |  |
Withholding taxes for stock options | (9,063) |  |  | (9,063) |  |  |  |
Issuance of common stock in connection with acquisitions (in shares) |  | 175,040 |  |  |  |  |  |
Issuance of common stock in connection with acquisitions | 0 | $ 0 |  | 0 |  |  |  |
Treasury stock activity related to vesting of equity instruments (in shares) |  |  |  |  | 133,319 |  |  |
Treasury stock activity related to vesting of equity instruments | $ (17,621) |  |  |  | $ (17,621) |  |  |
Common stock repurchases (in shares) | 2,317,617 |  |  |  | 2,317,617 |  |  |
Common stock repurchases | $ (294,467) |  |  |  | $ (294,467) |  |  |
Cash dividends | (175,920) |  |  | 0 |  | (175,920) |  |
Change in ownership of non-controlling interest related to trivago initial public offering (IPO) |  |  |  | 0 |  |  |  |
Other changes in non-controlling interests | 5,811 |  |  | 2,649 |  |  |  | 3,162
Sale of controlling interest in eLong |  |  |  | 0 |  |  |  |
Stock-based compensation expense | 147,843 |  |  | 147,843 |  |  |  |
Other | (1,006) |  |  | (1,006) |  |  |  |
Ending Balance (in shares) at Dec. 31, 2017 |  | 228,467,355 | 12,799,999 |  | 89,528,255 |  |  |
Ending Balance at Dec. 31, 2017 | $ 6,128,568 | $ 23 | $ 1 | $ 9,162,909 | $ (4,822,743) | $ 331,078 | $ (148,933) | $ 1,606,233

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