Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Operating Loss Carryforwards [Line Items] | |||
| Valuation allowance | $ 33 | $ (13,542) | $ (2,693) |
| Tax Credit Carryforward, Amount | 5,900 | ||
| Capital loss carryforwards and other than temporary impairment | 2,099 | 2,105 | |
| Expired Capital Loss Carryforward [Member] | |||
| Operating Loss Carryforwards [Line Items] | |||
| Tax Credit Carryforward, Amount | 100 | 63,700 | |
| Capital loss carryforwards and other than temporary impairment | 0 | 22,300 | |
| Capital Loss Carryforward [Member] | |||
| Operating Loss Carryforwards [Line Items] | |||
| Deferred Tax Assets, Valuation Allowance | $ 2,099 | $ 2,105 | |