RESERVES FOR LOSSES AND LOSS SETTLEMENT EXPENSES (Tables)

12 Months Ended

Dec. 31, 2016

Insurance Loss Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense

The following table provides an analysis of changes in our property and casualty losses and loss settlement expense reserves for 2016, 2015 and 2014 (net of reinsurance amounts):

Years Ended December 31,	2016			2015			2014
Gross liability for losses and loss settlement expenses at beginning of year	$	1,003,895		$	969,437		$	960,651
Ceded losses and loss settlement expenses	(54,653		)	(63,757		)	(75,150		)
Net liability for losses and loss settlement expenses at beginning of year	$	949,242		$	905,680		$	885,501
Losses and loss settlement expenses incurred for claims occurring during
Current year	$	683,662		$	560,482		$	566,555
Prior years	(31,229		)	(40,395		)	(56,744		)
Total incurred	$	652,433		$	520,087		$	509,811
Losses and loss settlement expense payments for claims occurring during
Current year	$	277,053		$	225,022		$	247,651
Prior years	260,520			251,503			241,981
Total paid	$	537,573		$	476,525		$	489,632
Net liability for losses and loss settlement expenses at end of year	$	1,064,102		$	949,242		$	905,680
Ceded loss and loss settlement expenses	59,794			54,653			63,757
Gross liability for losses and loss settlement expenses at end of year	$	1,123,896		$	1,003,895		$	969,437

Short-duration Insurance Contracts, Claims Development

Line of business: Commercial automobile
	Incurred losses and allocated loss settlement expenses, net of reinsurance																				As of December 31, 2016
	For the years ended December 31,																				Total of incurred but not reported liabilities plus expected development on reported claims		Cumulative development		Cumulative number of reported claims
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	71,186	$	68,864	$	67,566	$	69,968	$	69,802	$	69,368	$	68,986	$	68,756	$	68,900	$	68,872	$	5	(2,314	)	15,851
2008			80,461		78,391		76,051		76,527		75,070		75,021		73,506		73,431		73,463		68		(6,998	)	18,113
2009					80,021		69,328		68,569		64,121		64,516		63,605		63,560		63,567		38		(16,454	)	15,018
2010							75,781		68,068		65,860		67,015		67,563		67,296		68,086		121		(7,695	)	16,239
2011									84,887		87,299		90,750		92,519		92,379		91,336		647		6,449		15,224
2012											100,039		90,848		94,755		95,321		96,594		1,127		(3,445	)	14,335
2013													104,356		98,037		102,943		103,726		2,647		(630	)	15,462
2014															107,723		106,076		113,720		6,443		5,997		17,045
2015																	125,506		129,816		15,837		4,310		19,302
2016																			174,018		47,509				22,910
																	Total		$	983,198

Line of business: Commercial automobile
	Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
	For the years ended December 31,
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	27,058	$	42,688	$	53,231	$	62,272	$	65,798	$	67,634	$	68,074	$	68,439	$	68,794	$	68,834
2008			30,527		47,271		58,926		68,629		70,459		72,122		72,984		72,990		73,018
2009					27,674		44,867		53,451		58,087		61,398		62,732		63,495		63,503
2010							29,329		41,141		52,953		57,947		62,231		65,169		67,622
2011									34,332		50,931		65,021		79,383		85,348		87,475
2012											39,247		57,201		71,469		82,944		90,292
2013													43,592		67,630		79,663		90,780
2014															45,704		68,033		87,590
2015																	50,782		78,225
2016																			66,013
																	Total		$	773,352
					All outstanding liabilities for unpaid losses and loss settlement expenses before 2007, net of reinsurance														137
					Liabilities for unpaid losses and loss settlement expenses, net of reinsurance														$	209,984

Line of business: Workers' compensation
	Incurred losses and allocated loss settlement expenses, net of reinsurance																				As of December 31, 2016
	For the years ended December 31,																				Total of incurred but not reported liabilities plus expected development on reported claims		Cumulative development		Cumulative number of reported claims
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	36,494	$	35,972	$	33,430	$	32,986	$	31,933	$	31,945	$	32,276	$	31,200	$	31,095	$	31,255	$	261	(5,239	)	4,660
2008			42,739		42,301		39,895		41,278		40,474		40,010		39,386		39,680		39,768		564		(2,971	)	5,035
2009					43,560		39,009		36,294		36,837		36,823		36,158		36,014		35,026		392		(8,534	)	4,243
2010							38,210		42,531		41,180		41,167		40,647		41,422		41,468		745		3,258		3,923
2011									39,967		38,481		35,352		34,309		33,585		33,314		640		(6,653	)	3,799
2012											48,848		46,279		42,158		38,423		38,553		716		(10,295	)	3,687
2013													64,048		62,579		56,369		54,584		1,252		(9,464	)	3,949
2014															64,051		60,729		58,284		1,921		(5,767	)	4,105
2015																	53,788		55,578		2,818		1,790		4,366
2016																			70,419		10,858				3,847
																	Total		$	458,249

Line of business: Workers' compensation
	Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
	For the years ended December 31,
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	8,246	$	18,220	$	22,444	$	24,768	$	26,284	$	27,330	$	27,922	$	29,212	$	29,444	$	29,577
2008			10,082		21,227		25,736		30,123		31,980		33,770		34,319		34,862		35,292
2009					10,478		20,292		24,189		27,747		29,898		31,003		31,886		32,911
2010							11,821		22,606		28,765		31,887		33,119		34,143		35,052
2011									10,322		21,678		26,033		27,497		28,247		29,022
2012											11,802		23,023		28,397		30,933		33,063
2013													14,136		30,209		38,023		42,941
2014															13,965		30,289		38,441
2015																	12,063		27,304
2016																			14,413
																	Total		$	318,016
					All outstanding liabilities for unpaid losses and loss settlement expenses before 2007, net of reinsurance														20,072
					Liabilities for unpaid losses and loss settlement expenses, net of reinsurance														$	160,303

The following tables provide information about incurred and paid losses and loss settlement expense development as of December 31, 2016, net of reinsurance, as well as cumulative development, cumulative claim frequency and IBNR liabilities. Claim data for Mercer Insurance Group, which was acquired on March 28, 2011, is presented retrospectively.

The cumulative number of reported claims, for calendar year 2016, are counted for all lines of business on a per claimant per coverage basis and a single event may result in multiple claims due to the involvement of multiple individual claimants and / or multiple independent coverages. Claim counts for calendar years 2015 and prior are counted on a per claim and per coverage basis. Claim counts include open claims, claims that have been paid and closed, and reported claims that have been closed without the need for any payment.

Line of business: Commercial other liability
	Incurred losses and allocated loss settlement expenses, net of reinsurance																				As of December 31, 2016
	For the years ended December 31,																				Total of incurred but not reported liabilities plus expected development on reported claims		Cumulative development		Cumulative number of reported claims
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	64,793	$	64,117	$	71,032	$	72,407	$	67,115	$	61,811	$	76,740	$	76,130	$	74,956	$	76,049	$	12,056	11,256		6,948
2008			79,455		84,944		81,963		73,892		63,231		78,152		75,178		74,115		74,915		14,050		(4,540	)	6,506
2009					88,298		85,991		73,545		65,831		84,286		83,660		85,761		86,757		15,018		(1,541	)	5,915
2010							88,987		69,533		65,299		82,865		78,564		77,948		78,291		15,154		(10,696	)	5,060
2011									81,522		64,738		88,371		88,200		79,591		80,801		17,772		(721	)	5,193
2012											100,389		96,158		94,195		91,980		92,537		21,130		(7,852	)	5,426
2013													104,982		91,460		90,502		86,119		16,331		(18,863	)	5,787
2014															118,928		117,958		106,486		26,590		(12,442	)	5,769
2015																	137,386		125,307		43,435		(12,079	)	6,309
2016																			139,144		71,618				5,279
																	Total		$	946,406

Line of business: Commercial other liability
	Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
	For the years ended December 31,
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	6,054	$	17,542	$	31,120	$	41,306	$	51,337	$	53,663	$	56,838	$	59,085	$	60,429	$	61,499
2008			9,220		24,096		34,482		42,545		47,112		50,143		52,659		55,843		59,052
2009					8,375		21,151		32,073		41,696		50,098		56,789		63,149		67,733
2010							7,103		15,230		24,577		35,043		51,336		56,761		60,116
2011									6,236		13,670		26,260		40,595		50,146		56,150
2012											6,875		24,620		39,948		55,316		64,574
2013													9,835		25,228		39,953		54,559
2014															10,207		29,679		50,211
2015																	11,185		27,182
2016																			13,782
																	Total		$	514,858
					All outstanding liabilities for unpaid losses and loss settlement expenses before 2007, net of reinsurance														26,712
					Liabilities for unpaid losses and loss settlement expenses, net of reinsurance														$	458,261

Line of business: Personal
	Incurred losses and allocated loss settlement expenses, net of reinsurance																				As of December 31, 2016
	For the years ended December 31,																				Total of incurred but not reported liabilities plus expected development on reported claims		Cumulative development		Cumulative number of reported claims
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	29,005	$	28,358	$	28,074	$	27,837	$	27,521	$	27,427	$	27,376	$	27,384	$	27,368	$	27,345	$	34	(1,660	)	12,703
2008			49,961		44,686		43,408		43,672		43,577		43,535		43,515		43,482		42,882		70		(7,079	)	15,821
2009					34,597		33,519		31,945		32,026		32,134		32,029		32,085		32,070		140		(2,527	)	13,501
2010							36,686		34,347		33,928		33,865		33,403		33,413		33,432		201		(3,254	)	13,312
2011									50,014		48,534		47,090		47,035		46,968		47,013		300		(3,001	)	14,839
2012											47,924		46,199		46,403		46,150		44,715		427		(3,209	)	10,749
2013													39,232		38,525		37,262		37,086		628		(2,146	)	9,213
2014															53,910		52,661		52,944		796		(966	)	10,843
2015																	42,848		41,088		989		(1,760	)	9,313
2016																			48,072		3,928				10,291
																	Total		$	406,647

Line of business: Personal
	Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
	For the years ended December 31,
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	19,900	$	25,024	$	26,073	$	26,840	$	27,214	$	27,257	$	27,260	$	27,259	$	27,311	$	27,311
2008			32,032		40,114		41,735		42,414		42,613		42,627		42,748		42,748		42,787
2009					22,086		27,926		29,801		30,829		31,564		31,644		31,718		31,804
2010							24,499		29,867		31,340		32,076		32,771		32,997		33,165
2011									36,489		43,801		45,306		45,949		46,487		46,573
2012											30,415		41,979		43,375		44,448		43,569
2013													25,505		32,788		34,297		35,306
2014															37,055		47,912		49,710
2015																	29,551		37,431
2016																			32,999
																	Total		$	380,655
					All outstanding liabilities for unpaid losses and loss settlement expenses before 2007, net of reinsurance														1,800
					Liabilities for unpaid losses and loss settlement expenses, net of reinsurance														$	27,793

Line of business: Commercial fire & allied
	Incurred losses and allocated loss settlement expenses, net of reinsurance																				As of December 31, 2016
	For the years ended December 31,																				Total of incurred but not reported liabilities plus expected development on reported claims		Cumulative development		Cumulative number of reported claims
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	94,762	$	90,694	$	89,790	$	88,746	$	89,160	$	87,407	$	71,495	$	71,454	$	71,542	$	71,569	$	14	(23,193	)	18,351
2008			157,303		141,384		138,602		140,321		134,821		116,940		118,115		118,376		118,329		64		(38,974	)	21,086
2009					113,754		106,085		105,031		105,614		87,751		87,845		87,932		88,891		188		(24,863	)	18,017
2010							113,139		106,152		108,246		83,836		83,932		83,767		83,981		205		(29,158	)	16,647
2011									148,220		142,330		117,082		120,492		119,820		120,219		519		(28,001	)	15,989
2012											138,602		110,448		108,774		108,047		107,958		735		(30,644	)	6,361
2013													91,521		88,550		91,498		92,212		1,142		691		6,484
2014															126,216		131,198		128,762		2,178		2,546		7,650
2015																	103,177		108,293		3,577		5,116		6,976
2016																			147,473		14,476				7,142
																	Total		$	1,067,687

Line of business: Commercial fire & allied
	Cumulative paid losses and allocated loss settlement expenses, net of reinsurance
	For the years ended December 31,
Accident Year	2007		2008		2009		2010		2011		2012		2013		2014		2015		2016
	(Unaudited)
2007	$	40,578	$	56,759	$	59,322	$	63,329	$	68,928	$	70,960	$	71,178	$	71,360	$	71,376	$	71,406
2008			80,005		102,804		107,480		112,678		115,804		115,897		117,553		117,690		118,003
2009					53,219		72,181		77,732		82,809		86,930		87,544		87,721		88,037
2010							52,660		72,271		78,284		80,352		82,037		83,000		83,374
2011									85,585		104,800		109,429		112,497		116,614		118,183
2012											71,008		94,380		100,078		103,197		105,250
2013													59,331		78,226		82,853		86,115
2014															84,456		113,663		116,750
2015																	67,217		90,454
2016																			92,895
																	Total		$	970,467
					All outstanding liabilities for unpaid losses and loss settlement expenses before 2007, net of reinsurance														564
					Liabilities for unpaid losses and loss settlement expenses, net of reinsurance														$	97,785

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability

The reconciliation of the net incurred and loss development tables to the liability for unpaid losses and loss settlement expenses in the consolidated statement of financial position is as follows.

	December 31, 2016
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses:
Commercial other liability	$	458,261
Commercial fire and allied	97,785
Commercial automobile	209,984
Commercial workers' compensation	160,303
Personal	27,793
All other lines	26,510
Net outstanding liabilities for unpaid losses and allocated loss settlement expenses	980,636
Net outstanding liabilities for unpaid unallocated loss settlement expenses	79,751
Fair value adjustment (purchase accounting adjustment for Mercer acquisition)	3,715
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance	1,064,102
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses:
Commercial other liability	21,173
Commercial fire and allied	9,748
Commercial automobile	1,544
Commercial workers' compensation	29,686
Personal	41
All other lines	1,155
Reinsurance recoverable on unpaid losses and allocated loss settlement expenses	63,347
Reinsurance fair value amortization (purchase accounting adjustment for Mercer acquisition)	(3,553		)
Total reinsurance recoverable on unpaid losses and loss settlement expenses	59,794
Total gross liability for unpaid losses and loss settlement expenses	$	1,123,896

Short-duration Insurance Contracts, Schedule of Historical Claims Duration

The following is supplementary information about average historical claims duration as of December 31, 2016.

	Average annual percentage payout of incurred claims by age, net of reinsurance
	Year 1		Year 2		Year 3		Year 4		Year 5		Year 6		Year 7		Year 8		Year 9		Year 10
	(Unaudited)
Commercial other liability	9.4	%	15.3	%	15.6	%	14.3	%	11.9	%	5.8	%	4.8	%	4.2	%	3.0	%	1.4	%
Commercial fire and allied	63.9	%	21.0	%	4.7	%	3.9	%	3.7	%	1.2	%	0.6	%	0.2	%	0.1	%	—	%
Commercial automobile	40.5	%	21.2	%	15.1	%	11.3	%	5.5	%	2.7	%	1.7	%	0.2	%	0.3	%	0.1	%
Commercial workers' compensation	26.4	%	29.1	%	13.3	%	8.0	%	4.4	%	3.2	%	2.0	%	2.8	%	0.9	%	0.4	%
Personal	71.5	%	19.2	%	4.0	%	2.3	%	0.9	%	0.3	%	0.3	%	0.1	%	0.1	%	—	%