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Investments - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
£ / shares
Jun. 30, 2016
£ / shares
Investment [Line Items]              
Share price (in gbp per share) | £ / shares           £ 4.25  
Asset impairment charges     $ 520 $ 2,087 $ 355    
Cost method investment              
Investment [Line Items]              
Available-for-sale securities, debt securities   $ 1,000 1,000 2,800      
Highview Enterprises Limited              
Investment [Line Items]              
Ownership interest, percent 8.00%            
Payments to acquire investments $ 2,800            
Highview Enterprises Limited | Cost method investment              
Investment [Line Items]              
Share price (in gbp per share) | £ / shares             £ 2
Highview Enterprises Limited | Cost method investment | Other              
Investment [Line Items]              
Asset impairment charges   1,800          
Certificates of deposit              
Investment [Line Items]              
Investments   $ 0 $ 0 $ 300