Income Taxes Income Taxes - Unrecognized tax benefits (Details) $ in Thousands  | 
3 Months Ended | 
|---|---|
| 
 Mar. 31, 2016  
USD ($) 
 | |
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |
| Balance, beginning of period | $ 2,200 | 
| Additions for prior year tax positions | 0 | 
| Settlements with tax authorities | 0 | 
| Reductions of prior year tax positions | 0 | 
| Balance, end of period | $ 2,200 | 
| 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 taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |