Investments (Major Categories of Net Realized Gains on Investments) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Schedule of Available-for-sale Securities [Line Items] | |||
| Gain on investments | $ 5,826 | $ 408 | $ 10,540 |
| Other-than-temporary impairments | (3,323) | (274) | |
| Net realized gain | 2,503 | 134 | 10,540 |
| Corporate Bonds [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Gain on investments | 263 | 853 | |
| Collateralized Corporate Bank Loans [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Gain on investments | 126 | 109 | 373 |
| Municipal Bonds [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Gain on investments | (83) | (140) | (156) |
| Collateralized Mortgage Backed Securities [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Gain on investments | 240 | 32 | |
| Equity Securities [Member] | |||
| Schedule of Available-for-sale Securities [Line Items] | |||
| Gain on investments | $ 5,543 | $ 144 | $ 9,470 |