Annual report pursuant to Section 13 and 15(d)

Income Taxes (NOL) (Details)

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Income Taxes (NOL) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Operating Loss Carryforwards  
AMT credits $ 1,455
Federal  
Operating Loss Carryforwards  
NOL carryforwards 267,000
Federal | Research and development  
Operating Loss Carryforwards  
Tax credit carryforward 15,259
State  
Operating Loss Carryforwards  
NOL carryforwards 153,000
State | Alternative minimum  
Operating Loss Carryforwards  
Tax credit carryforward 19
State | Research and development  
Operating Loss Carryforwards  
Tax credit carryforward 9,452
Foreign  
Operating Loss Carryforwards  
Tax credit carryforward $ 1,401
Minimum  
Operating Loss Carryforwards  
AMT credits refundable , Percent 50.00%
Maximum  
Operating Loss Carryforwards  
AMT credits refundable , Percent 100.00%