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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 |  |

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