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, 2017
USD ($)
Federal  
Operating Loss Carryforwards  
NOL carryforwards $ 249,653
Federal | Research and development  
Operating Loss Carryforwards  
Tax credit carryforward 10,430
State  
Operating Loss Carryforwards  
NOL carryforwards 143,775
State | Alternative minimum  
Operating Loss Carryforwards  
Tax credit carryforward 21
State | Research and development  
Operating Loss Carryforwards  
Tax credit carryforward 8,103
Foreign  
Operating Loss Carryforwards  
Tax credit carryforward $ 2,459
Minimum  
Operating Loss Carryforwards  
AMT credits refundable , Percent 50.00%
Maximum  
Operating Loss Carryforwards  
AMT credits refundable , Percent 100.00%