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Loss and Loss Adjustment Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Summary of Development Tables of Incurred and Paid Claims and Allocated Claim Adjustment Expenses Net of Reinsurance |
| Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance |  |  | As of |
| For the Years Ended December 31, |  |  | December 31, 2017 |
| (Dollars in thousands) |  |  | Total IBNR |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Plus |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Expected |  | Cumulative |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Development |  | Number of |
Accident | Unaudited (1) |  |  |  |  |  | on Reported |  | Claims |
Year | 2008 |  | 2009 |  | 2010 |  | 2011 |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  |  | Claims |  | Reported |
2008 | $ | 196,923 |  | $ | 200,371 |  | $ | 195,619 |  | $ | 190,905 |  | $ | 187,695 |  | $ | 184,547 |  | $ | 182,846 |  | $ | 183,608 |  | $ | 182,901 |  | $ | 182,646 |  |  | $ | 2,649 |  |  | 6,487 |
2009 |  | - |  |  | 185,359 |  |  | 188,746 |  |  | 188,462 |  |  | 187,943 |  |  | 184,006 |  |  | 182,274 |  |  | 177,795 |  |  | 176,586 |  |  | 177,015 |  |  |  | 3,345 |  |  | 5,371 |
2010 |  | - |  |  | - |  |  | 179,156 |  |  | 202,479 |  |  | 208,035 |  |  | 205,769 |  |  | 198,861 |  |  | 193,029 |  |  | 191,000 |  |  | 189,403 |  |  |  | 5,805 |  |  | 5,971 |
2011 |  | - |  |  | - |  |  | - |  |  | 196,384 |  |  | 199,522 |  |  | 199,163 |  |  | 198,213 |  |  | 195,262 |  |  | 192,988 |  |  | 191,126 |  |  |  | 6,968 |  |  | 6,041 |
2012 |  | - |  |  | - |  |  | - |  |  | - |  |  | 222,549 |  |  | 222,075 |  |  | 212,738 |  |  | 193,515 |  |  | 184,460 |  |  | 182,859 |  |  |  | 7,840 |  |  | 5,746 |
2013 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 241,810 |  |  | 241,811 |  |  | 233,656 |  |  | 220,457 |  |  | 214,701 |  |  |  | 10,501 |  |  | 5,762 |
2014 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 268,846 |  |  | 268,846 |  |  | 249,097 |  |  | 235,058 |  |  |  | 13,503 |  |  | 5,827 |
2015 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 262,573 |  |  | 262,573 |  |  | 252,514 |  |  |  | 22,863 |  |  | 5,506 |
2016 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 250,491 |  |  | 250,491 |  |  |  | 17,066 |  |  | 5,346 |
2017 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 244,094 |  |  |  | 7,964 |  |  | 4,919 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  | $ | 2,119,907 |  |  | $ | 98,504 |  |  |  |
| Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance |  |  |  |  |
| For the Years Ended December 31, |  |  |  |  |
| (Dollars in thousands) |  |  |  |  |
Accident | Unaudited (1) |  |  |  |  |  | Claim |
Year | 2008 |  | 2009 |  | 2010 |  | 2011 |  | 2012 |  | 2013 |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  |  | Frequency (2) |
2008 | $ | 47,685 |  | $ | 103,057 |  | $ | 132,515 |  | $ | 147,377 |  | $ | 157,388 |  | $ | 163,933 |  | $ | 166,814 |  | $ | 170,347 |  | $ | 171,496 |  | $ | 173,138 |  |  |  | 20.98 |
2009 |  | - |  |  | 42,332 |  |  | 96,173 |  |  | 123,946 |  |  | 142,667 |  |  | 150,925 |  |  | 155,365 |  |  | 158,214 |  |  | 159,345 |  |  | 160,580 |  |  |  | 19.82 |
2010 |  | - |  |  | - |  |  | 47,520 |  |  | 108,714 |  |  | 141,029 |  |  | 156,974 |  |  | 165,834 |  |  | 169,565 |  |  | 172,426 |  |  | 175,019 |  |  |  | 24.94 |
2011 |  | - |  |  | - |  |  | - |  |  | 53,329 |  |  | 111,029 |  |  | 140,831 |  |  | 153,968 |  |  | 161,639 |  |  | 165,967 |  |  | 167,757 |  |  |  | 22.81 |
2012 |  | - |  |  | - |  |  | - |  |  | - |  |  | 50,579 |  |  | 107,467 |  |  | 133,658 |  |  | 149,161 |  |  | 154,553 |  |  | 157,206 |  |  |  | 18.72 |
2013 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 51,396 |  |  | 119,507 |  |  | 150,304 |  |  | 165,994 |  |  | 172,479 |  |  |  | 16.54 |
2014 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 53,060 |  |  | 119,820 |  |  | 153,320 |  |  | 169,736 |  |  |  | 14.96 |
2015 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 54,141 |  |  | 121,599 |  |  | 151,818 |  |  |  | 14.22 |
2016 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 52,238 |  |  | 115,713 |  |  |  | 14.11 |
2017 |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 56,951 |  |  |  | 13.86 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  | 1,500,397 |  |  |  |  |
All outstanding claim liabilities before 2008, net of reinsurance |  |  | 67,446 |  |  |  |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance |  |  | 686,956 |  |  |  |  |
(1) Data presented for these calendar years is required supplementary information, which is unaudited. |
(2) Frequency, as calculated above, refers to reported claims divided by gross premium earned. |
Summary of Average Annual Percentage Payout of Incurred Claims by Age Net of Reinsurance for Worker's Compensation and General Liability | The average annual percentage payout of incurred claims by age, net of reinsurance, for workers’ compensation and general liability as of December 31, 2017 is summarized below. Since workers’ compensation has long payout periods, the table below shows less than 100% in the years disclosed. This is required supplementary information, which is unaudited.
Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (Unaudited) |
Year 1 |  | Year 2 |  | Year 3 |  | Year 4 |  | Year 5 |  | Year 6 |  | Year 7 |  | Year 8 |  | Year 9 |  | Year 10 |
24.3% |  | 29.6% |  | 14.9% |  | 8.1% |  | 4.1% |  | 2.4% |  | 1.4% |  | 1.3% |  | 0.7% |  | 0.9% |
Reconciliation of Beginning and Ending Reserve Balances, Net of Related Amounts Recoverable from Reinsurers | The following table provides a reconciliation of the beginning and ending reserve balances, net of related amounts recoverable from reinsurers, for 2017, 2016 and 2015:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Balance, beginning of period |  | $ | 742,776 |  |  | $ | 718,033 |  |  | $ | 687,602 |
Less amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses |  |  | 78,256 |  |  |  | 64,858 |  |  |  | 59,334 |
Net balance, beginning of period |  |  | 664,520 |  |  |  | 653,175 |  |  |  | 628,268 |
Add incurred related to: |  |  |  |  |  |  |  |  |  |  |  |
Current accident year |  |  | 244,094 |  |  |  | 250,337 |  |  |  | 262,387 |
Prior accident years |  |  | (34,770 | ) |  |  | (51,306 | ) |  |  | (47,814 | )
Total incurred |  |  | 209,324 |  |  |  | 199,031 |  |  |  | 214,573 |
Less paid related to: |  |  |  |  |  |  |  |  |  |  |  |
Current accident year |  |  | 56,951 |  |  |  | 52,085 |  |  |  | 53,955 |
Prior accident years |  |  | 129,937 |  |  |  | 135,601 |  |  |  | 135,711 |
Total paid |  |  | 186,888 |  |  |  | 187,686 |  |  |  | 189,666 |
Net balance, end of period |  |  | 686,956 |  |  |  | 664,520 |  |  |  | 653,175 |
Add amounts recoverable from reinsurers on unpaid loss and loss adjustment expenses |  |  | 84,889 |  |  |  | 78,256 |  |  |  | 64,858 |
Balance, end of period |  | $ | 771,845 |  |  | $ | 742,776 |  |  | $ | 718,033 |
Summary Exposures to Various Asbestos Related Claims | The following table details our exposures to various asbestos related claims:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Reserves for loss and LAE at beginning of year |  | $ | 1,487 |  |  | $ | 958 |  |  | $ | 819 |
Incurred losses and LAE during the current year |  |  | 556 |  |  |  | 816 |  |  |  | 444 |
Loss and LAE payments |  |  | (295 | ) |  |  | (287 | ) |  |  | (305 | )
Reserves for loss and LAE at end of year |  | $ | 1,748 |  |  | $ | 1,487 |  |  | $ | 958 |

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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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