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Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Redeemable Noncontrolling Interest | Class A | Class B | Class C | Class D | Cumulative Dividends | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | UHS Common Stockholders' Equity | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 4,309,161 |  | $ 66 | $ 910 | $ 7 | $ 0 | $ (294,728) | $ 4,566,521 | $ (23,129) | $ 4,249,647 | $ 59,514
Balance at Dec. 31, 2015 |  | $ 242,509 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Issued/(converted) including tax benefits from exercise of stock options | 54,853 |  |  | 13 |  |  |  | 54,840 |  | 54,853 |
Repurchased | (346,890) |  |  | (30) |  |  |  | (346,860) |  | (346,890) |
Restricted share-based compensation expense | 1,439 |  |  |  |  |  |  | 1,439 |  | 1,439 |
Dividends paid | (38,875) |  |  |  |  |  | (38,875) |  |  | (38,875) |
Stock option expense | 45,777 |  |  |  |  |  |  | 45,777 |  | 45,777 |
Distributions to noncontrolling interests | (17,735) | (51,847) |  |  |  |  |  |  |  |  | (17,735)
Acquisition of noncontrolling interests in majority owned businesses | (132,852) | (206,200) |  |  |  |  |  | (132,852) |  | (132,852) |
Other | 2,690 |  |  |  |  |  |  |  |  |  | 2,690
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Net income to UHS / noncontrolling interests | 722,314 |  |  |  |  |  |  | 702,409 |  | 702,409 | 19,905
Net income attributable to redeemable noncontrolling interest |  | 24,857 |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments | (10,038) |  |  |  |  |  |  |  | (10,038) | (10,038) |
Amortization of terminated hedge (net of income tax effect) | (107) |  |  |  |  |  |  |  | (107) | (107) |
Unrealized loss on marketable security (net of income tax effect) | (1,398) |  |  |  |  |  |  |  | (1,398) | (1,398) |
Unrealized derivative gains on cash flow hedges (net of income tax effect) | 902 |  |  |  |  |  |  |  | 902 | 902 |
Minimum pension liability (net of income tax effect) | 8,353 |  |  |  |  |  |  |  | 8,353 | 8,353 |
Subtotal - comprehensive income | 720,026 |  |  |  |  |  |  | 702,409 | (2,288) | 700,121 | 19,905
Subtotal attributable to redeemable noncontrolling interest |  | 24,857 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | 4,597,594 |  | 66 | 893 | 7 |  | (333,603) | 4,891,274 | (25,417) | 4,533,220 | 64,374
Balance at Dec. 31, 2016 |  | 9,319 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Issued/(converted) including tax benefits from exercise of stock options | 10,379 |  |  | 9 |  |  |  | 10,370 |  | 10,379 |
Repurchased | (356,413) |  |  | (33) |  |  |  | (356,380) |  | (356,413) |
Restricted share-based compensation expense | 1,377 |  |  |  |  |  |  | 1,377 |  | 1,377 |
Dividends paid | (38,211) |  |  |  |  |  | (38,211) |  |  | (38,211) |
Stock option expense | 54,265 |  |  |  |  |  |  | 54,265 |  | 54,265 |
Distributions to noncontrolling interests | (22,932) | (1,781) |  |  |  |  |  |  |  |  | (22,932)
Other | 635 |  |  |  |  |  |  |  |  |  | 635
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Net income to UHS / noncontrolling interests | 772,148 |  |  |  |  |  |  | 752,303 |  | 752,303 | 19,845
Net income attributable to redeemable noncontrolling interest |  | (836) |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments | 26,678 |  |  |  |  |  |  |  | 26,678 | 26,678 |
Unrealized loss on marketable security (net of income tax effect) | (1,360) |  |  |  |  |  |  |  | (1,360) | (1,360) |
Unrealized derivative gains on cash flow hedges (net of income tax effect) | 4,189 |  |  |  |  |  |  |  | 4,189 | 4,189 |
Minimum pension liability (net of income tax effect) | 3,087 |  |  |  |  |  |  |  | 3,087 | 3,087 |
Subtotal - comprehensive income | 804,742 |  |  |  |  |  |  | 752,303 | 32,594 | 784,897 | 19,845
Subtotal attributable to redeemable noncontrolling interest |  | (836) |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | 5,051,436 |  | 66 | 869 | 7 |  | (371,814) | 5,353,209 | 7,177 | 4,989,514 | 61,922
Balance at Dec. 31, 2017 |  | 6,702 |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  |  |  | (3,353) | 3,353 |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Issued/(converted) including tax benefits from exercise of stock options | 11,888 |  |  | 6 |  |  |  | 11,882 |  | 11,888 |
Repurchased | (414,002) |  |  | (34) |  |  |  | (413,968) |  | (414,002) |
Restricted share-based compensation expense | 2,924 |  |  |  |  |  |  | 2,924 |  | 2,924 |
Dividends paid | (37,342) |  |  |  |  |  | (37,342) |  |  | (37,342) |
Stock option expense | 61,061 |  |  |  |  |  |  | 61,061 |  | 61,061 |
Distributions to noncontrolling interests | (12,095) | (2,500) |  |  |  |  |  |  |  |  | (12,095)
Other | 8,616 |  |  |  |  |  |  |  |  |  | 8,616
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |
Net income to UHS / noncontrolling interests | 797,793 |  |  |  |  |  |  | 779,705 |  | 779,705 | 18,088
Net income attributable to redeemable noncontrolling interest |  | 90 |  |  |  |  |  |  |  |  |
Reclassification due to the adoption of ASU No. 201802 |  |  |  |  |  |  |  | 1,802 | (1,802) |  |
Foreign currency translation adjustments | 2,894 |  |  |  |  |  |  |  | 2,894 | 2,894 |
Unrealized derivative gains on cash flow hedges (net of income tax effect) | (2,138) |  |  |  |  |  |  |  | (2,138) | (2,138) |
Minimum pension liability (net of income tax effect) | (5,242) |  |  |  |  |  |  |  | (5,242) | (5,242) |
Subtotal - comprehensive income | 793,307 |  |  |  |  |  |  | 778,154 | (2,935) | 775,219 | 18,088
Subtotal attributable to redeemable noncontrolling interest |  | 90 |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 5,465,793 |  | $ 66 | $ 841 | $ 7 | $ 0 | $ (409,156) | $ 5,793,262 | $ 4,242 | $ 5,389,262 | $ 76,531
Balance at Dec. 31, 2018 | $ 4,000 | $ 4,292 |  |  |  |  |  |  |  |  |

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