Annual report pursuant to Section 13 and 15(d)

Other Non-Current Assets (Details)

v3.8.0.1
Other Non-Current Assets (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 01, 2016
Sep. 30, 2017
Jul. 31, 2017
Apr. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets to fund deferred compensation liability         $ 5,185 $ 2,738  
Deposits:              
Lease         4,291 4,262  
Other         615 2,083  
Unamortized issuance costs on revolving credit facility         3,106    
Investments in private companies         2,731 2,750  
Other         1,248 2,130  
Total other non-current assets         17,176 13,963  
Upfront consideration         $ 445    
Carrying value of investment           0  
Ownership interest (as a percent)         50.00%    
Other Income              
Deposits:              
Impairment loss           734  
Class B units              
Deposits:              
Units owned         756,347    
Historical purchase price         $ 1,250    
Number of shares purchased     738,463 150,000      
Upfront consideration     $ 738 $ 1,500      
Company's share of loss           $ 1,420 $ 84
Ownership interest (as a percent)     16.20% 10.30%      
Class A units              
Deposits:              
Number of shares purchased 1,500,000 1,450,000          
Upfront consideration $ 1,500 $ 1,450          
Company's share of loss         $ 1,469    
Ownership interest (as a percent) 21.40% 34.50%          
Class A units | Maximum              
Deposits:              
Ownership interest (as a percent)         50.00%