Annual report pursuant to Section 13 and 15(d)

Discontinued Operations (Narrative) (Details)

v3.8.0.1
Discontinued Operations (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 07, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from Divestiture of Interest in Consolidated Subsidiaries     $ (921) $ 60,875
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax       8,436
Gregory Mountain Products, Inc. [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Transition services   $ 0 0 232
POC [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration $ 63,639     63,639
Discontinued Operation, Transaction Fees 2,946      
Cash sold 739      
Proceeds from Divestiture of Interest in Consolidated Subsidiaries $ 60,693      
Working capital adjustment     921  
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax       8,436
Transition services   $ 0 $ 324 $ 270