Fair Value (Details 3) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair value by pricing source
Available-for-sale securities	$ 615,213	$ 599,941
Fair value measurements on a recurring basis
Fair value by pricing source
Available-for-sale securities	615,213	599,941
Total	622,470	604,467
Fair value measurements on a recurring basis | Fixed maturities
Fair value by pricing source
Available-for-sale securities	606,281	587,209
Fair value measurements on a recurring basis | Fixed maturities | Priced via pricing services
Fair value by pricing source
Available-for-sale securities	594,244
Fair value measurements on a recurring basis | Fixed maturities | Priced via market comparables/broker quotes
Fair value by pricing source
Available-for-sale securities	12,037
Fair value measurements on a recurring basis | Common stock
Fair value by pricing source
Available-for-sale securities	8,932	12,732
Trading and available-for-sale securities	11,887
Fair value measurements on a recurring basis | Common stock | Priced via pricing services
Fair value by pricing source
Trading and available-for-sale securities	11,887
Fair value measurements on a recurring basis | Real estate
Fair value by pricing source
Other investments	4,302	4,526
Fair value measurements on a recurring basis | Real estate | Priced via unobservable inputs
Fair value by pricing source
Other investments	4,302
Fair value measurements on a recurring basis | Level 1
Fair value by pricing source
Available-for-sale securities	8,932	12,732
Total	11,887	12,732
Fair value measurements on a recurring basis | Level 1 | Fixed maturities
Fair value by pricing source
Available-for-sale securities	0	0
Fair value measurements on a recurring basis | Level 1 | Fixed maturities | Priced via pricing services
Fair value by pricing source
Available-for-sale securities	0
Fair value measurements on a recurring basis | Level 1 | Fixed maturities | Priced via market comparables/broker quotes
Fair value by pricing source
Available-for-sale securities	0
Fair value measurements on a recurring basis | Level 1 | Common stock
Fair value by pricing source
Available-for-sale securities	8,932	12,732
Trading and available-for-sale securities	11,887
Fair value measurements on a recurring basis | Level 1 | Common stock | Priced via pricing services
Fair value by pricing source
Trading and available-for-sale securities	11,887
Fair value measurements on a recurring basis | Level 2
Fair value by pricing source
Available-for-sale securities	589,423	578,563
Total	589,423	578,563
Fair value measurements on a recurring basis | Level 2 | Fixed maturities
Fair value by pricing source
Available-for-sale securities	589,423	578,563
Fair value measurements on a recurring basis | Level 2 | Fixed maturities | Priced via pricing services
Fair value by pricing source
Available-for-sale securities	589,423
Fair value measurements on a recurring basis | Level 2 | Fixed maturities | Priced via market comparables/broker quotes
Fair value by pricing source
Available-for-sale securities	0
Fair value measurements on a recurring basis | Level 2 | Common stock
Fair value by pricing source
Available-for-sale securities	0	0
Trading and available-for-sale securities	0
Fair value measurements on a recurring basis | Level 2 | Common stock | Priced via pricing services
Fair value by pricing source
Trading and available-for-sale securities	0
Fair value measurements on a recurring basis | Level 3
Fair value by pricing source
Available-for-sale securities	16,858	8,646
Total	16,858	8,646
Fair value measurements on a recurring basis | Level 3 | Priced via market comparables/broker quotes
Fair value by pricing source
Available-for-sale securities	16,900
Fair value measurements on a recurring basis | Level 3 | Fixed maturities
Fair value by pricing source
Available-for-sale securities	16,858	8,646
Fair value measurements on a recurring basis | Level 3 | Fixed maturities | Priced via pricing services
Fair value by pricing source
Available-for-sale securities	4,821
Fair value measurements on a recurring basis | Level 3 | Fixed maturities | Priced via market comparables/broker quotes
Fair value by pricing source
Available-for-sale securities	12,037
Fair value measurements on a recurring basis | Level 3 | Common stock
Fair value by pricing source
Available-for-sale securities	0	$ 0
Trading and available-for-sale securities	0
Fair value measurements on a recurring basis | Level 3 | Common stock | Priced via pricing services
Fair value by pricing source
Trading and available-for-sale securities	0
Fair value measurements on a nonrecurring basis
Fair value by pricing source
Total	$ 0