Income Tax Expense (Narrative) (Details) - USD ($) |
Dec. 31, 2016 |
Dec. 31, 2015 |
---|---|---|
Income Tax Contingency [Line Items] | ||
Unrecognized tax benefits | $ 0 | $ 0 |
Federal [Member] | ||
Income Tax Contingency [Line Items] | ||
Net operating loss carryforwards | 254,000,000 | |
State [Member] | ||
Income Tax Contingency [Line Items] | ||
Net operating loss carryforwards | $ 3,000,000 |