Fair Value (Details 3) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair value by pricing source
Available-for-sale securities	$ 653,635	$ 599,941
Fair value measurements on a recurring basis
Fair value by pricing source
Available-for-sale securities	653,635	599,941
Total	658,039	604,467
Fair value measurements on a recurring basis | Fixed maturities
Fair value by pricing source
Available-for-sale securities	644,521	587,209
Fair value measurements on a recurring basis | Fixed maturities | Priced via pricing services
Fair value by pricing source
Available-for-sale securities	642,318
Fair value measurements on a recurring basis | Fixed maturities | Priced via market comparables/broker quotes
Fair value by pricing source
Available-for-sale securities	2,203
Fair value measurements on a recurring basis | Common stock
Fair value by pricing source
Available-for-sale securities	9,114	12,732
Trading and available-for-sale securities	9,610
Fair value measurements on a recurring basis | Common stock | Priced via pricing services
Fair value by pricing source
Trading and available-for-sale securities	9,610
Fair value measurements on a recurring basis | Real estate
Fair value by pricing source
Other investments	3,908	4,526
Fair value measurements on a recurring basis | Real estate | Priced via unobservable inputs
Fair value by pricing source
Other investments	3,908
Fair value measurements on a recurring basis | Level 1
Fair value by pricing source
Available-for-sale securities	9,114	12,732
Total	9,610	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	9,114	12,732
Trading and available-for-sale securities	9,610
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	9,610
Fair value measurements on a recurring basis | Level 2
Fair value by pricing source
Available-for-sale securities	633,467	578,563
Total	633,467	578,563
Fair value measurements on a recurring basis | Level 2 | Fixed maturities
Fair value by pricing source
Available-for-sale securities	633,467	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	633,467
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	11,054	8,646
Total	11,054	8,646
Fair value measurements on a recurring basis | Level 3 | Non-binding broker quotes classified within Level 3
Fair value by pricing source
Available-for-sale securities	11,100
Fair value measurements on a recurring basis | Level 3 | Fixed maturities
Fair value by pricing source
Available-for-sale securities	11,054	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	8,851
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	2,203
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