Investments Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | $ 91,965 | $ 30,647 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (1,166) | (334) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 13,070 | 32,900 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (247) | (624) |
Available-for-sale securities, continuous unrealized loss position, fair value | 105,035 | 63,547 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (1,413) | (958) |
Total Corporate | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 39,188 | 11,563 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (621) | (132) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 1,220 | 4,522 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (23) | (72) |
Available-for-sale securities, continuous unrealized loss position, fair value | 40,408 | 16,085 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (644) | (204) |
US Government Agencies Debt Securities | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 19,508 | 2,228 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (309) | (3) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 4,646 | 9,395 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (44) | (156) |
Available-for-sale securities, continuous unrealized loss position, fair value | 24,154 | 11,623 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (353) | (159) |
Corporate Debt Securities, Banking and Financial Services | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 12,444 | 3,298 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (170) | (14) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 596 | 1,523 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (5) | (17) |
Available-for-sale securities, continuous unrealized loss position, fair value | 13,040 | 4,821 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (175) | (31) |
Corporate Debt Securities, Consumer Goods | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 6,225 | 269 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (69) | 0 |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 0 | 714 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | (13) |
Available-for-sale securities, continuous unrealized loss position, fair value | 6,225 | 983 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (69) | (13) |
Corporate Debt Securities, Capital Goods | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 7,356 | 2,599 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (108) | (19) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 538 | 1,543 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (18) | (33) |
Available-for-sale securities, continuous unrealized loss position, fair value | 7,894 | 4,142 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (126) | (52) |
Corporate Debt Securities, Energy | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 3,805 | 2,583 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (49) | (82) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 86 | 86 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | (2) |
Available-for-sale securities, continuous unrealized loss position, fair value | 3,891 | 2,669 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (49) | (84) |
Corporate Debt Securities, Telecommunications and Utilities | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 6,948 | 1,371 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (194) | (7) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 0 | 168 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | (1) |
Available-for-sale securities, continuous unrealized loss position, fair value | 6,948 | 1,539 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (194) | (8) |
Corporate Debt Securities, Health Care | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 2,410 | 1,443 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (31) | (10) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 0 | 488 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | (6) |
Available-for-sale securities, continuous unrealized loss position, fair value | 2,410 | 1,931 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (31) | (16) |
Fixed Income, U.S., Mortgage Backed, Total | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 22,278 | 5,605 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (220) | (33) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 6,853 | 18,983 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (176) | (396) |
Available-for-sale securities, continuous unrealized loss position, fair value | 29,131 | 24,588 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (396) | (429) |
Fixed Income, U.S., Mortgage Backed, Agency | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 15,241 | 4,196 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (176) | (28) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 2,131 | 9,202 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (43) | (132) |
Available-for-sale securities, continuous unrealized loss position, fair value | 17,372 | 13,398 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (219) | (160) |
Commercial Mortgage Backed Securities | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 7,037 | 1,409 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (44) | (5) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 4,722 | 9,781 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (133) | (264) |
Available-for-sale securities, continuous unrealized loss position, fair value | 11,759 | 11,190 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (177) | (269) |
Asset-backed Securities | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 10,971 | 10,021 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (13) | (27) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 351 | 0 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (4) | 0 |
Available-for-sale securities, continuous unrealized loss position, fair value | 11,322 | 10,021 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (17) | (27) |
Fixed income securities | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 91,945 | 29,417 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (1,163) | (195) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 13,070 | 32,900 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (247) | (624) |
Available-for-sale securities, continuous unrealized loss position, fair value | 105,015 | 62,317 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (1,410) | (819) |
Equities | | |
Gain (Loss) on Investments [Line Items] | | |
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value | 20 | 1,230 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (3) | (139) |
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value | 0 | 0 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | 0 | 0 |
Available-for-sale securities, continuous unrealized loss position, fair value | 20 | 1,230 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | $ (3) | $ (139) |