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Accounts Receivable | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable: Accounts receivable consists of the following (in millions):
| As of December 31,
| 2017 |  | 2016
Current: |  |  |
Patient accounts receivable, net of allowance for doubtful accounts of $60.9 million in 2017; $53.9 million in 2016 | $ | 459.5 |  |  | $ | 432.0 |
Other accounts receivable | 12.6 |  |  | 11.8 |
| 472.1 |  |  | 443.8 |
Noncurrent patient accounts receivable, net of allowance for doubtful accounts of $52.2 million in 2017; $49.5 million in 2016 | 129.1 |  |  | 125.9 |
Accounts receivable, net | $ | 601.2 |  |  | $ | 569.7 |
Because the resolution of claims that are part of Medicare audit programs can take in excess of three years, we review the patient receivables that are part of this adjudication process to determine their appropriate classification as either current or noncurrent. Amounts considered noncurrent are included in Other long-term assets in our consolidated balance sheet. At December 31, 2017 and 2016, our allowance for doubtful accounts represented approximately 16.1% and 15.6%, respectively, of the total patient due accounts receivable balance. The following is the activity related to our allowance for doubtful accounts (in millions):
For the Year Ended December 31, |  | Balance at Beginning of Period |  | Additions and Charges to Expense |  | Deductions and Accounts Written Off |  | Balance at End of Period
2017 |  | $ | 103.4 |  |  | $ | 52.4 |  |  | $ | (42.7 | ) |  | $ | 113.1 |
2016 |  | $ | 71.6 |  |  | $ | 61.2 |  |  | $ | (29.4 | ) |  | $ | 103.4 |
2015 |  | $ | 43.0 |  |  | $ | 47.2 |  |  | $ | (18.6 | ) |  | $ | 71.6 |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(6)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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