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RESERVE FOR LOSSES AND LOSS EXPENSES | 3 Months Ended
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Mar. 31, 2019
Insurance Loss Reserves [Abstract] |
RESERVE FOR LOSSES AND LOSS EXPENSES | Reserve Roll-Forward The following table presents a reconciliation of the Company's beginning and ending gross reserve for losses and loss expenses and net reserve for unpaid losses and loss expenses for the periods indicated:
|  | Three months ended March 31, |
|  | 2019 |  | 2018 |
| Gross reserve for losses and loss expenses, beginning of period | $ | 12,280,769 |  |  | $ | 12,997,553 |  |
| Less reinsurance recoverable on unpaid losses, beginning of period | (3,501,669 | ) |  | (3,159,514 | ) |
| Net reserve for unpaid losses and loss expenses, beginning of period | 8,779,100 |  |  | 9,838,039 |  |
| Net incurred losses and loss expenses related to: |  |  |  |
| Current year | 678,700 |  |  | 715,652 |  |
| Prior years | (14,672 | ) |  | (54,307 | ) |
|  | 664,028 |  |  | 661,345 |  |
| Net paid losses and loss expenses related to: |  |  |  |
| Current year | (37,600 | ) |  | (48,814 | ) |
| Prior years | (691,558 | ) |  | (675,393 | ) |
|  | (729,158 | ) |  | (724,207 | ) |
| Foreign exchange and other | 6,460 |  |  | (726,781 | ) |
| Net reserve for unpaid losses and loss expenses, end of period | 8,720,430 |  |  | 9,048,396 |  |
| Reinsurance recoverable on unpaid losses, end of period | 3,555,341 |  |  | 2,986,247 |  |
| Gross reserve for losses and loss expenses, end of period | $ | 12,275,771 |  |  | $ | 12,034,643 |  |
The Company writes business with loss experience generally characterized as low frequency and high severity in nature, which can result in volatility in its financial results. During the three months ended March 31, 2019, the Company recognized net losses and loss expenses of $11 million (2018: $35 million) attributable to catastrophe and weather-related events. On January 1, 2018, AXIS Managing Agency Limited, the managing agent of Syndicate 2007 entered into an agreement for the RITC of the 2015 and prior years of account of Syndicate 2007. This agreement was accounted for as a novation reinsurance contract. At March 31, 2018, foreign exchange and other included a reduction in reserves for losses and loss expenses of $819 million related to this transaction. Prior Year Development The Company's net favorable prior year reserve development arises from changes to loss and loss expense estimates related to loss events that occurred in previous calendar years. The following table presents net prior year reserve development by segment:
|  | Three months ended March 31, |
|  | 2019 |  | 2018 |
| Insurance | $ | 6,913 |  |  | $ | 22,775 |  |
| Reinsurance | 7,759 |  |  | 31,532 |  |
| Total | $ | 14,672 |  |  | $ | 54,307 |  |
The following tables map the Company's line of business to reserve classes and the expected claim tails:
Insurance segment |  |  |  |  |
| Reserve class and tail
| Property and other | Marine | Aviation | Credit and political risk | Professional lines | Liability
| Short | Short | Short/Medium | Medium | Medium | Long
Reported lines of business |  |  |  |  |  |
Property | X |  |  |  |  |
Marine |  | X |  |  |  |
Terrorism | X |  |  |  |  |
Aviation |  |  | X |  |  |
Credit and political risk |  |  |  | X |  |
Professional lines |  |  |  |  | X |
Liability |  |  |  |  |  | X
Accident and health | X |  |  |  |  |
Discontinued lines - Novae | X |  |  |  | X | X
Reinsurance segment |  |  |  |
| Reserve class and tail
| Property and other | Credit and surety | Professional lines | Motor | Liability
| Short | Medium | Medium | Long | Long
Reported lines of business |  |  |  |  |
Catastrophe | X |  |  |  |
Property | X |  |  |  |
Credit and surety |  | X |  |  |
Professional lines |  |  | X |  |
Motor |  |  |  | X |
Liability |  |  |  |  | X
Engineering | X |  |  |  |
Agriculture | X |  |  |  |
Marine and other | X |  |  |  |
Accident and health | X |  |  |  |
Discontinued lines - Novae | X |  |  | X | X
Short-tail business Short-tail business includes the underlying exposures in property and other, marine and aviation reserve classes within the insurance segment, and the property and other reserve class within the reinsurance segment. For the three months ended March 31, 2019, these reserve classes recognized net adverse prior year reserve development of $33 million including $22 million of net adverse prior year reserve development recognized by the insurance property and other reserve class and $29 million of net adverse prior year reserve development recognized by the reinsurance property and other reserve class, partially offset by net favorable prior year development of $16 million contributed by the insurance marine class. For the three months ended March 31, 2018, these reserve classes contributed net favorable prior year reserve development of $37 million reflecting the recognition of better than expected loss emergence. Medium-tail business Medium-tail business consists primarily of insurance and reinsurance professional lines reserve classes, credit and political risk insurance reserve class and credit and surety reinsurance reserve class. For the three months ended March 31, 2019, the credit and surety reinsurance reserve class recorded net favorable prior year reserve development of $10 million (2018: $6 million) reflecting the recognition of better than expected loss emergence. For the three months ended March 31, 2019, the insurance professional lines reserve class recognized net favorable prior year development of $6 million (2018: $4 million). For the three months ended March 31, 2018, the reinsurance professional lines reserve class recognized net favorable prior year reserve development of $9 million. The net favorable prior year loss development on these reserve classes continued to reflect generally favorable experience on older accident years as the Company continued to transition to more experienced based methods. Long-tail business Long-tail business consists primarily of insurance and reinsurance liability reserve classes and reinsurance motor reserve classes. For the three months ended March 31, 2019, the reinsurance liability reserve class contributed net favorable prior year reserve development of $12 million (2018: $2 million). For the three months ended March 31, 2019, the net favorable prior year reserve development was due to increased weight given by management to experience based indications on older accident years. For the three months ended March 31, 2018, the insurance liability reserve class recorded net adverse prior year development of $7 million primarily related to reserve strengthening within the Company's U.S. excess casualty book of business reflecting slightly higher than expected prior year emerging loss experience. For the three months ended March 31, 2019, the motor reinsurance reserve class contributed net favorable prior year reserve development of $12 million (2018: $3 million). For the three months ended March 31, 2019, the net favorable prior year reserve development was primarily attributable to non proportional treaty business on older accident years. At March 31, 2019, net reserves for losses and loss expenses included estimated amounts for numerous catastrophe events. The magnitude and/or complexity of losses arising from these events, in particular California Wildfires, Hurricanes Michael and Florence, and Typhoons Jebi and Trami which occurred in 2018 as well as Hurricanes Harvey, Irma and Maria, the two earthquakes in Mexico and the California Wildfires which occurred in 2017 inherently increase the level of uncertainty and, therefore, the level of management judgment involved in arriving at the estimated net reserves for losses and loss expenses. As a result, actual losses for these events may ultimately differ materially from the Company's current estimates.

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- Definition The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -URI http://asc.fasb.org/subtopic&trid=2560295 + Details
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