Income Taxes - Changes in Gross Amounts of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
| Balance at beginning of the year | $ 103,640 | $ 104,491 |
| Additions based on tax positions related to current year | 0 | 0 |
| Additions for tax positions of prior years | 0 | 0 |
| Reductions for tax positions of prior years | (728) | (851) |
| Settlements | 0 | 0 |
| Balance at end of the year | 102,912 | $ 103,640 |
| Excess Tax Benefit From Share Based Compensation To Be Realized Upon Utilization Of Net Operating Loss Carryforward | $ 177,300 | |
| X | ||||||||||
- Definition Excess Tax Benefit From Share Based Compensation To Be Realized Upon Utilization Of Net Operating Loss Carryforward No definition available.
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|