Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details)

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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Goodwill [Roll Forward]          
Balance as of beginning of period     $ 198,622    
Adjustments from the Ultra Seating acquisition        
Balance as of end of period $ 198,622   198,622    
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets 4,004 $ 4,004 8,008 $ 8,008  
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 202,164   202,164   $ 202,164
Accumulated Amortization (98,238)   (98,238)   (90,230)
Accumulated Impairment Loss (1,025)   (1,025)   (1,025)
Net Intangible Assets 102,901   102,901   110,909
Supply Chain Management          
Goodwill [Roll Forward]          
Balance as of beginning of period     63,190    
Adjustments from the Ultra Seating acquisition        
Balance as of end of period 63,190   63,190    
Federal Services          
Goodwill [Roll Forward]          
Balance as of beginning of period     30,883    
Adjustments from the Ultra Seating acquisition        
Balance as of end of period 30,883   30,883    
Aviation          
Goodwill [Roll Forward]          
Balance as of beginning of period     104,549    
Adjustments from the Ultra Seating acquisition        
Balance as of end of period 104,549   104,549    
Contract and customer-related          
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 173,094   173,094   173,094
Accumulated Amortization (79,506)   (79,506)   (72,937)
Accumulated Impairment Loss (1,025)   (1,025)   (1,025)
Net Intangible Assets 92,563   92,563   99,132
Acquired technologies          
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 12,400   12,400   12,400
Accumulated Amortization (7,969)   (7,969)   (7,406)
Accumulated Impairment Loss 0   0   0
Net Intangible Assets 4,431   4,431   4,994
Trade names          
Finite-Lived Intangible Assets, Net [Abstract]          
Cost 16,670   16,670   16,670
Accumulated Amortization (10,763)   (10,763)   (9,887)
Accumulated Impairment Loss 0   0   0
Net Intangible Assets $ 5,907   $ 5,907   $ 6,783