INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	$ 1,203,978	$ 1,123,407
Gross unrealized gains	128,038	98,434
Gross unrealized losses	7,481	24,009
Estimated fair value	1,324,535us-gaap_AvailableForSaleSecurities	1,197,832us-gaap_AvailableForSaleSecurities
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	74,394	318,108
Less than twelve months, Unrealized losses	2,142	18,717
Twelve months or longer, Fair value	152,526	43,692
Twelve months or longer, Unrealized losses	5,339	5,292
Total, Fair value	226,920	361,800
Total, Unrealized losses	7,481	24,009
Amortized cost
Due in one year or less	33,469
Due after one year through five years	194,140
Due after five years through ten years	223,145
Due after ten years	485,960
Mortgage-backed securities	143,292
Totals	1,080,006	1,009,572
Estimated fair value
Due in one year or less	33,945
Due after one year through five years	204,973
Due after five years through ten years	229,778
Due after ten years	514,088
Mortgage-backed securities	144,715
Totals	1,127,499	1,027,984
Realized Investment Gains (Losses) [Abstract]
'Other-than-temporary' impairments	(878)	(63)	(186)
Net realized investment gains (losses)	4,349us-gaap_GainLossOnInvestments	8,997us-gaap_GainLossOnInvestments	8,017us-gaap_GainLossOnInvestments
Investment Income, Net [Abstract]
Interest on fixed maturity securities	41,932us-gaap_InvestmentIncomeInterest	40,062us-gaap_InvestmentIncomeInterest	41,699us-gaap_InvestmentIncomeInterest
Dividends on equity securities	6,007us-gaap_InvestmentIncomeDividend	4,619us-gaap_InvestmentIncomeDividend	3,852us-gaap_InvestmentIncomeDividend
Interest on short-term investments	0emci_InterestOnShortTermInvestments	27emci_InterestOnShortTermInvestments	129emci_InterestOnShortTermInvestments
Return on long-term investments	297emci_InterestOnLongTermInvestments	22emci_InterestOnLongTermInvestments	12emci_InterestOnLongTermInvestments
Total investment income	48,236emci_GrossInvestmentIncome	44,730emci_GrossInvestmentIncome	45,692emci_GrossInvestmentIncome
Securities litigation income	107emci_SecurityLitigationIncome	219emci_SecurityLitigationIncome	58emci_SecurityLitigationIncome
Investment expenses	(1,878)	(1,927)	(1,605)
Net investment income (loss)	46,465us-gaap_NetInvestmentIncome	43,022us-gaap_NetInvestmentIncome	44,145us-gaap_NetInvestmentIncome
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax [Abstract]
Deferred income tax expense (benefit)	16,146	(11,539)	10,043
Net changes in unrealized holding gains (losses) net of tax	29,986	(21,430)	18,652
Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	1,080,006	1,009,572
Gross unrealized gains	54,148	41,236
Gross unrealized losses	6,655	22,824
Estimated fair value	1,127,499	1,027,984
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	65,655	308,972
Less than twelve months, Unrealized losses	1,633	18,048
Twelve months or longer, Fair value	150,623	42,208
Twelve months or longer, Unrealized losses	5,022	4,776
Total, Fair value	216,278	351,180
Total, Unrealized losses	6,655	22,824
Realized Investment Gains (Losses) [Abstract]
Available-for-sale, Gross realized investment gains	979	1,226	795
Available-for-sale, Gross realized investment losses	(92)	(725)	(10)
'Other-than-temporary' impairments	(1)	0	0
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax [Abstract]
Net changes in unrealized holding gains (losses) before tax	29,081	(60,540)	20,687
Deferred income tax expense (benefit)	10,179	(21,189)	7,240
Net changes in unrealized holding gains (losses) net of tax	18,902	(39,351)	13,447
US Treasury Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	9,574	9,540
Gross unrealized gains	129	191
Gross unrealized losses	0	319
Estimated fair value	9,703	9,412
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value		4,507
Less than twelve months, Unrealized losses		319
Twelve months or longer, Fair value		0
Twelve months or longer, Unrealized losses		0
Total, Fair value		4,507
Total, Unrealized losses		319
US Government-sponsored Enterprises Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	215,425	156,981
Gross unrealized gains	2,313	1,356
Gross unrealized losses	2,122	11,391
Estimated fair value	215,616	146,946
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	24,473	93,856
Less than twelve months, Unrealized losses	94	8,120
Twelve months or longer, Fair value	97,446	24,053
Twelve months or longer, Unrealized losses	2,028	3,271
Total, Fair value	121,919	117,909
Total, Unrealized losses	2,122	11,391
US States and Political Subdivisions Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	299,258	346,554
Gross unrealized gains	26,840	15,040
Gross unrealized losses	40	4,542
Estimated fair value	326,058	357,052
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	0	74,523
Less than twelve months, Unrealized losses	0	4,335
Twelve months or longer, Fair value	3,757	3,008
Twelve months or longer, Unrealized losses	40	207
Total, Fair value	3,757	77,531
Total, Unrealized losses	40	4,542
Commercial Mortgage Backed Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	42,996	63,185
Gross unrealized gains	3,766	5,842
Gross unrealized losses	0	88
Estimated fair value	46,762	68,939
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,102	10,551
Less than twelve months, Unrealized losses	0	88
Twelve months or longer, Fair value	0	0
Twelve months or longer, Unrealized losses	0	0
Total, Fair value	1,102	10,551
Total, Unrealized losses	0	88
Residential Mortgage Backed Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	100,296	96,058
Gross unrealized gains	1,402	1,073
Gross unrealized losses	3,745	2,952
Estimated fair value	97,953	94,179
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	21,451	44,243
Less than twelve months, Unrealized losses	1,252	2,482
Twelve months or longer, Fair value	21,163	4,600
Twelve months or longer, Unrealized losses	2,493	470
Total, Fair value	42,614	48,843
Total, Unrealized losses	3,745	2,952
Collateralized Debt Obligations [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	14,798	11,456
Gross unrealized gains	1,213	1,192
Gross unrealized losses	6	0
Estimated fair value	16,005	12,648
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,889
Less than twelve months, Unrealized losses	6
Twelve months or longer, Fair value	0
Twelve months or longer, Unrealized losses	0
Total, Fair value	1,889
Total, Unrealized losses	6
Corporate Debt Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	397,659	325,798
Gross unrealized gains	18,485	16,542
Gross unrealized losses	742	3,532
Estimated fair value	415,402	338,808
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	16,740	81,292
Less than twelve months, Unrealized losses	281	2,704
Twelve months or longer, Fair value	28,257	10,547
Twelve months or longer, Unrealized losses	461	828
Total, Fair value	44,997	91,839
Total, Unrealized losses	742	3,532
Equity Securities [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	123,972	113,835
Gross unrealized gains	73,890	57,198
Gross unrealized losses	826	1,185
Estimated fair value	197,036	169,848
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	8,739	9,136
Less than twelve months, Unrealized losses	509	669
Twelve months or longer, Fair value	1,903	1,484
Twelve months or longer, Unrealized losses	317	516
Total, Fair value	10,642	10,620
Total, Unrealized losses	826	1,185
Realized Investment Gains (Losses) [Abstract]
Available-for-sale, Gross realized investment gains	8,913	9,458	9,984
Available-for-sale, Gross realized investment losses	(1,727)	(899)	(2,566)
'Other-than-temporary' impairments	(877)	(63)	(186)
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax [Abstract]
Net changes in unrealized holding gains (losses) before tax	17,051	27,571	8,008
Deferred income tax expense (benefit)	5,967	9,650	2,803
Net changes in unrealized holding gains (losses) net of tax	11,084	17,921	5,205
Common stocks Financial services [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	22,586	19,273
Gross unrealized gains	11,835	9,374
Gross unrealized losses	42	149
Estimated fair value	34,379	28,498
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,162	2,801
Less than twelve months, Unrealized losses	9	149
Twelve months or longer, Fair value	187	0
Twelve months or longer, Unrealized losses	33	0
Total, Fair value	1,349	2,801
Total, Unrealized losses	42	149
Common stocks Information technology [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	15,755	12,645
Gross unrealized gains	11,110	6,301
Gross unrealized losses	0	29
Estimated fair value	26,865	18,917
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value		610
Less than twelve months, Unrealized losses		29
Twelve months or longer, Fair value		0
Twelve months or longer, Unrealized losses		0
Total, Fair value		610
Total, Unrealized losses		29
Common stocks Healthcare [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	14,673	12,801
Gross unrealized gains	12,179	9,144
Gross unrealized losses	0	0
Estimated fair value	26,852	21,945
Common stocks Consumer staples [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	10,584	9,162
Gross unrealized gains	6,112	3,849
Gross unrealized losses	2	0
Estimated fair value	16,694	13,011
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,051	30
Less than twelve months, Unrealized losses	2	0
Twelve months or longer, Fair value	0	0
Twelve months or longer, Unrealized losses	0	0
Total, Fair value	1,051	30
Total, Unrealized losses	2	0
Common stocks Consumer discretionary [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	11,304	10,722
Gross unrealized gains	11,420	10,309
Gross unrealized losses	33	0
Estimated fair value	22,691	21,031
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	822
Less than twelve months, Unrealized losses	33
Twelve months or longer, Fair value	0
Twelve months or longer, Unrealized losses	0
Total, Fair value	822
Total, Unrealized losses	33
Common stocks Energy [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	15,837	14,102
Gross unrealized gains	7,458	7,341
Gross unrealized losses	432	326
Estimated fair value	22,863	21,117
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	4,298	1,450
Less than twelve months, Unrealized losses	432	326
Twelve months or longer, Fair value	0	0
Twelve months or longer, Unrealized losses	0	0
Total, Fair value	4,298	1,450
Total, Unrealized losses	432	326
Common stocks Industrials [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	9,658	11,190
Gross unrealized gains	8,596	6,075
Gross unrealized losses	33	1
Estimated fair value	18,221	17,264
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	1,406	625
Less than twelve months, Unrealized losses	33	1
Twelve months or longer, Fair value	0	0
Twelve months or longer, Unrealized losses	0	0
Total, Fair value	1,406	625
Total, Unrealized losses	33	1
Common stocks Other [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	11,493	13,358
Gross unrealized gains	4,563	4,489
Gross unrealized losses	0	36
Estimated fair value	16,056	17,811
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value		1,499
Less than twelve months, Unrealized losses		36
Twelve months or longer, Fair value		0
Twelve months or longer, Unrealized losses		0
Total, Fair value		1,499
Total, Unrealized losses		36
Nonredeemable Preferred Stock [Member]
Amortized cost and estimated fair value of available-for-sale securities [Abstract]
Amortized cost	12,082	10,582
Gross unrealized gains	617	316
Gross unrealized losses	284	644
Estimated fair value	12,415	10,254
Available for sale securities continuous unrealized loss position [Abstract]
Less than twelve months, Fair value	0	2,121
Less than twelve months, Unrealized losses	0	128
Twelve months or longer, Fair value	1,716	1,484
Twelve months or longer, Unrealized losses	284	516
Total, Fair value	1,716	3,605
Total, Unrealized losses	284	644
Other Long-term Investments [Member]
Realized Investment Gains (Losses) [Abstract]
Other long-term investments, Gross realized investment losses	$ (2,846)	$ 0	$ 0

Investment income before investment expense.

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Amounts received for security litigation.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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