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Other long-term liabilities - Preferred Shares, Series C (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
USD ($)
Class of Stock [Line Items]      
Contingent consideration related to prior acquisition $ 16,000    
Gain on contingent consideration 12,000    
Preferred stock redemption price per share (in USD per share) | $ / shares   $ 25  
2019 334,855    
2020 308,917    
2021 111,880    
2022 343,737    
2023 481,859    
Thereafter to 2031 1,740,471    
Total Preferred shares series C $ 13,418   $ 14,718
Series C Preferred Stock      
Class of Stock [Line Items]      
Redeemable preferred stock issued, shares | shares 100    
Preferred stock redemption price per share (in USD per share) | $ / shares   $ 53,400  
Less amounts representing interest $ (5,993)    
Total Preferred shares series C 13,418    
Less current portion (940)    
Preferred shares series C, noncurrent 12,478    
Series C Preferred Stock | Dividends Payable      
Class of Stock [Line Items]      
2019 940    
2020 985    
2021 1,000    
2022 1,019    
2023 1,183    
Thereafter to 2031 10,370    
Redemption amount 3,914    
Estimated dividend and redemption payments $ 19,411    
Executives of company | Series C Preferred Stock      
Class of Stock [Line Items]      
Redeemable preferred stock issued, shares | shares 36