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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Redeemable Noncontrolling Interest | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 4,422,813 | $ 0 | $ 811 | $ 1,598,887 | $ 3,487,079 | $ (429,321) | $ (239,450) | $ 4,807
Beginning balance (in shares) at Dec. 31, 2014 |  |  | 81,070,000 |  |  |  | (8,157,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
IVC Group acquisition | 153,096 |  |  | 129,445 |  |  | $ 23,651 |
IVC Group acquisition (in shares) |  |  |  |  |  |  | 806,000 |
Shares issued under employee and director stock plans | (6,530) |  | $ 2 | (6,536) |  |  | $ 4 |
Shares issued under employee and director stock plans (in shares) |  |  | 210,000 |  |  |  |  |
Stock-based compensation expense | 32,552 |  |  | 32,552 |  |  |  |
Tax benefit from stock-based compensation | 5,668 |  |  | 5,668 |  |  |  |
Accretion of redeemable noncontrolling interest | (194) | 194 |  |  | (194) |  |  |
Noncontrolling earnings | 256 | 1,428 |  |  |  |  |  | 256
Currency translation adjustment on noncontrolling interests | (970) | (713) |  |  |  |  |  | (970)
Acquisition of noncontrolling interest, net of taxes | 3,117 | 21,043 |  |  | 520 |  |  | 2,597
Currency translation adjustment | (360,147) |  |  |  |  | (360,147) |  |
Prior pension and post-retirement benefit service cost and actuarial gain (loss) | (4,100) |  |  |  |  | (4,100) |  |
Net income | 615,302 |  |  |  | 615,302 |  |  |
Ending balance at Dec. 31, 2015 | 4,860,863 | 21,952 | $ 813 | 1,760,016 | 4,102,707 | (793,568) | $ (215,795) | 6,690
Ending balance (in shares) at Dec. 31, 2015 |  |  | 81,280,000 |  |  |  | (7,351,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares issued under employee and director stock plans | (8,226) |  | $ 2 | (8,232) |  |  | $ 4 |
Shares issued under employee and director stock plans (in shares) |  |  | 239,000 |  |  |  |  |
Stock-based compensation expense | 35,059 |  |  | 35,059 |  |  |  |
Tax benefit from stock-based compensation | 4,697 |  |  | 4,697 |  |  |  |
Accretion of redeemable noncontrolling interest | (123) | 123 |  |  | (123) |  |  |
Noncontrolling earnings | 340 | 2,864 |  |  |  |  |  | 340
Currency translation adjustment on noncontrolling interests | (26) | (1,243) |  |  |  |  |  | (26)
Acquisition of noncontrolling interest, net of taxes | 0 |  |  |  | (32) |  |  | 32
Currency translation adjustment | (36,702) |  |  |  |  | (36,702) |  |
Prior pension and post-retirement benefit service cost and actuarial gain (loss) | (2,757) |  |  |  |  | (2,757) |  |
Net income | 930,362 |  |  |  | 930,362 |  |  |
Ending balance at Dec. 31, 2016 | 5,783,487 | 23,696 | $ 815 | 1,791,540 | 5,032,914 | (833,027) | $ (215,791) | 7,036
Ending balance (in shares) at Dec. 31, 2016 |  |  | 81,519,000 |  |  |  | (7,351,000) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares issued under employee and director stock plans | 297 |  | $ 3 | 269 |  |  | $ 25 |
Shares issued under employee and director stock plans (in shares) |  |  | 252,000 |  |  |  | 1,000 |
Stock-based compensation expense | 36,322 |  |  | 36,322 |  |  |  |
Distribution to noncontrolling interest, net of adjustments | (750) |  |  |  |  |  |  | (750)
Accretion of redeemable noncontrolling interest | (46) | 46 |  |  | (46) |  |  |
Noncontrolling earnings | 510 | 2,544 |  |  |  |  |  | 510
Currency translation adjustment on noncontrolling interests | 1,051 | 3,177 |  |  |  |  |  | 1,051
Currency translation adjustment | 277,427 |  |  |  |  | 277,427 |  |
Prior pension and post-retirement benefit service cost and actuarial gain (loss) | (2,927) |  |  |  |  | (2,927) |  |
Net income | 971,638 |  |  |  | 971,638 |  |  |
Ending balance at Dec. 31, 2017 | $ 7,067,009 | $ 29,463 | $ 818 | $ 1,828,131 | $ 6,004,506 | $ (558,527) | $ (215,766) | $ 7,847
Ending balance (in shares) at Dec. 31, 2017 |  |  | 81,771,000 |  |  |  | (7,350,000) |

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