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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
OPERATING ACTIVITIES |  |
Net income including non-controlling interests | $ 19,018 | $ 19,758
Adjustments to reconcile net income including non-controlling interests to net cash provided by operating activities: |  |
Depreciation and amortization | 7,269 | 6,210
Provision for doubtful accounts | 2,716 | 2,962
Loss on sale of fixed assets | 83 | 31
Equity-based awards compensation expense | 3,410 | 3,748
Deferred income tax | 291 | 3,238
Changes in operating assets and liabilities: |  |
Increase in patient accounts receivable | (1,914) | (2,548)
(Increase) decrease in accounts receivable - other | (4,736) | 116
Increase in other assets | (787) | (4,979)
Increase in accounts payable and accrued expenses | 8,126 | 3,582
Increase in mandatorily redeemable non-controlling interests | 7,069 | 5,372
Increase in other liabilities | 286 | 1,506
Net cash provided by operating activities | 40,831 | 38,996
INVESTING ACTIVITIES |  |
Purchase of fixed assets | (5,576) | (5,620)
Purchase of businesses, net of cash acquired | (33,740) | (12,958)
Acquisitions of non-controlling interests | 0 | (664)
Proceeds on sale of fixed assets, net | 67 | 42
Net cash used in investing activities | (39,249) | (19,200)
FINANCING ACTIVITIES |  |
Distributions to non-controlling interests | (3,698) | (4,441)
Cash dividends paid to shareholders | (7,547) | (6,382)
Proceeds from revolving line of credit | 63,000 | 128,000
Payments on revolving line of credit | (53,000) | (136,000)
Payments to settle mandatorily redeemable non-controlling interests | (2,230) | (1,136)
Principal payments on notes payable | (776) | (592)
Other | 40 | 1
Net cash used in financing activities | (4,211) | (20,550)
Net increase in cash and cash equivalents | (2,629) | (754)
Cash and cash equivalents - beginning of period | 20,047 | 15,778
Cash and cash equivalents - end of period | 17,418 | 15,024
Cash paid during the period for: |  |
Income taxes | 8,059 | 10,051
Interest | 1,616 | 770
Non-cash investing and financing transactions during the period: |  |
Purchase of business - seller financing portion | 1,650 | 500
Acquisition of non-controlling interest - seller financing portion | 0 | 388
Payment to settle redeemable non-controlling interest - financing portion | 0 | 126
Sale of non-controlling interests | $ 0 | $ (148)

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Acquisition of non-controlling interest - seller financing portion in noncash investing or financing activities. + References No definition available. + Details
Name: | usph_AcquisitionOfNoncontrollingInterestSellerFinancingPortion
Namespace Prefix: | usph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | usph_CashPaidDuringPeriodForAbstract
Namespace Prefix: | usph_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in mandatorily redeemable non-controlling interests. + References No definition available. + Details
Name: | usph_IncreaseDecreaseInMandatorilyRedeemableNonControllingInterests
Namespace Prefix: | usph_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of payment to settle redeemable non-controlling interest related to financing portion during the period. + References No definition available. + Details
Name: | usph_PaymentToSettleRedeemableNonControllingInterestFinancingPortion
Namespace Prefix: | usph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Purchase of business - seller financing portion in noncash investing or financing activities. + References No definition available. + Details
Name: | usph_PurchaseOfBusinessSellerFinancingPortion
Namespace Prefix: | usph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Refers to amount of noncontrolling interest sold by an entity during the period. + References No definition available. + Details
Name: | usph_SaleOfNoncontrollingInterest
Namespace Prefix: | usph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration