Investments - Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities
Other investments, cost	$ 535,560	$ 527,183
Gross unrealized gains	9,493	7,598
Gross unrealized loss	3,947	6,134
Total investments	541,106	528,647
U.S. Government and Agency Securities
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	142,284	151,656
Gross unrealized gains	204	189
Gross unrealized loss	1,597	1,893
Fair Value	140,891	149,952
Foreign Government
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	2,028	2,031
Gross unrealized gains	32	30
Gross unrealized loss	0	0
Fair Value	2,060	2,061
States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	154,545	170,636
Gross unrealized gains	1,205	1,027
Gross unrealized loss	1,164	2,551
Fair Value	154,586	169,112
Public Utilities
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	12,243	7,687
Gross unrealized gains	118	116
Gross unrealized loss	68	73
Fair Value	12,293	7,730
Corporate Securities
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	184,582	164,424
Gross unrealized gains	1,387	1,238
Gross unrealized loss	834	1,126
Fair Value	185,135	164,536
Redeemable Preferred Stocks
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	1,187	1,182
Gross unrealized gains	24	5
Gross unrealized loss	52	62
Fair Value	1,159	1,125
Fixed Maturities
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	496,869	497,616
Gross unrealized gains	2,970	2,605
Gross unrealized loss	3,715	5,705
Fair Value	496,124	494,516
Public Utilities
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	1,342	1,343
Gross unrealized gains	227	164
Gross unrealized loss	0	0
Fair Value	1,569	1,507
Other Common Stock
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	19,815	19,815
Gross unrealized gains	5,893	4,552
Gross unrealized loss	155	319
Fair Value	25,553	24,048
Nonredeemable Preferred Stocks
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	2,916	2,916
Gross unrealized gains	58	10
Gross unrealized loss	57	83
Fair Value	2,917	2,843
Equity Securities
Schedule of Available-for-sale Securities
Cost or adjusted/amortized cost	24,073	24,074
Gross unrealized gains	6,178	4,726
Gross unrealized loss	212	402
Fair Value	30,039	28,398
Other Long-term Investments
Schedule of Available-for-sale Securities
Other investments, cost	14,618	5,493
Gross unrealized gains	345	267
Gross unrealized loss	20	27
Other Long-term Investments	$ 14,943	$ 5,733