Investments Reconciliation, Investments by Category (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	$ 372,182	$ 350,063
Available-for-sale Securities, Amortized Cost Basis	399,890	375,090
Available-for-sale Equity Securities, Amortized Cost Basis	23,393	22,278
Available-for-sale Securities, Gross Unrealized Gains	10,292	8,230
Available-for-sale Securities, Gross Unrealized Losses	1,348	1,693
Available-for-sale Securities, Debt Securities	377,353	352,630
Available-for-sale Securities, Equity Securities	26,878	25,987
Other Long-term Investments	4,603us-gaap_OtherLongTermInvestments	3,010us-gaap_OtherLongTermInvestments
Total investments	408,834us-gaap_Investments	381,627us-gaap_Investments
U.S. government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	108,457	134,601
Available-for-sale Securities, Gross Unrealized Gains	886	423
Available-for-sale Securities, Gross Unrealized Losses	205	590
Available-for-sale Securities, Debt Securities	109,138	134,434
Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3,271	3,275
Available-for-sale Securities, Gross Unrealized Gains	136	79
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities, Debt Securities	3,407	3,354
States, municipalities and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	123,631	90,262
Available-for-sale Securities, Gross Unrealized Gains	2,399	1,866
Available-for-sale Securities, Gross Unrealized Losses	437	217
Available-for-sale Securities, Debt Securities	125,593	91,911
Public Utility, Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	9,039	9,044
Available-for-sale Securities, Gross Unrealized Gains	289	217
Available-for-sale Securities, Gross Unrealized Losses	8	39
Available-for-sale Securities, Debt Securities	9,320	9,222
All Other Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	125,770	111,787
Available-for-sale Securities, Gross Unrealized Gains	2,324	1,409
Available-for-sale Securities, Gross Unrealized Losses	170	580
Available-for-sale Securities, Debt Securities	127,924	112,616
Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2,014
Available-for-sale Securities, Amortized Cost Basis			1,094
Available-for-sale Securities, Gross Unrealized Gains	27		9
Available-for-sale Securities, Gross Unrealized Losses	70		10
Available-for-sale Securities, Debt Securities	1,971		1,093
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	372,182
Available-for-sale Securities, Amortized Cost Basis	372,182	350,063
Available-for-sale Securities, Gross Unrealized Gains	6,061	4,003
Available-for-sale Securities, Gross Unrealized Losses	890	1,436
Available-for-sale Securities, Debt Securities	377,353	352,630
Public Utility, Equities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	1,223	1,222
Available-for-sale Securities, Gross Unrealized Gains	97	211
Available-for-sale Securities, Gross Unrealized Losses	6	0
Available-for-sale Securities, Equity Securities	1,314	1,433
Other Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	19,866	19,560
Available-for-sale Securities, Gross Unrealized Gains	3,791	3,738
Available-for-sale Securities, Gross Unrealized Losses	430	250
Available-for-sale Securities, Equity Securities	23,227	23,048
Nonredeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis	2,304	1,496
Available-for-sale Securities, Gross Unrealized Gains	55	17
Available-for-sale Securities, Gross Unrealized Losses	22	7
Available-for-sale Securities, Equity Securities	2,337	1,506
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	23,393	22,278
Available-for-sale Securities, Gross Unrealized Gains	3,943	3,966
Available-for-sale Securities, Gross Unrealized Losses	458	257
Available-for-sale Securities, Equity Securities	26,878	25,987
Other Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	4,315	2,749
Available-for-sale Securities, Gross Unrealized Gains	288	261
Available-for-sale Securities, Gross Unrealized Losses	0	0
Other Long-term Investments	$ 4,603	$ 3,010

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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