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Revenues (Notes) | 12 Months Ended
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Dec. 31, 2018
Revenues [Abstract] |
Revenue from Contract with Customer | Revenues The following tables present revenue disaggregated by product line and timing of revenue recognition for the years ended December 31, 2018, 2017 and 2016:
| 2018
| Orthopedic Surgery |  | General Surgery |  | Total
Timing of Revenue Recognition |  |  |  |  |
Goods transferred at a point in time | $ | 413,630 |  |  | $ | 411,391 |  |  | $ | 825,021 |
Services transferred over time | 33,098 |  |  | 1,515 |  |  | 34,613 |
Total sales from contracts with customers | $ | 446,728 |  |  | $ | 412,906 |  |  | $ | 859,634 |
| 2017
| Orthopedic Surgery |  | General Surgery |  | Total
Timing of Revenue Recognition |  |  |  |  |
Goods transferred at a point in time | $ | 396,147 |  |  | $ | 366,672 |  |  | $ | 762,819 |
Services transferred over time | 32,797 |  |  | 776 |  |  | 33,573 |
Total sales from contracts with customers | $ | 428,944 |  |  | $ | 367,448 |  |  | $ | 796,392 |
| 2016
| Orthopedic Surgery |  | General Surgery |  | Total
Timing of Revenue Recognition |  |  |  |  |
Goods transferred at a point in time | $ | 391,114 |  |  | $ | 341,276 |  |  | $ | 732,390 |
Services transferred over time | 30,989 |  |  | 141 |  |  | 31,130 |
Total sales from contracts with customers | $ | 422,103 |  |  | $ | 341,417 |  |  | $ | 763,520 |
Revenue disaggregated by primary geographic market where the products are sold is included in Note 10. Contract liability balances related to the sale of extended warranties to customers are as follows:
| December 31, 2018 |  | December 31, 2017
Contract Liability | $ | 11,043 |  |  | $ | 7,786 |
Revenue recognized during years ended December 31, 2018, 2017 and 2016 from amounts included in contract liabilities at the beginning of the period were $5.0 million, $3.9 million and $3.5 million, respectively. There were no material contract assets as of December 31, 2018 and December 31, 2017.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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