Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Other Long Term Liabilities (Details)

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Summary of Significant Accounting Policies - Other Long Term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Accrued lease liability $ 27,760 $ 28,086
Liabilities related to acquisitions 13,000 1,607
Other long-term liabilities 753 150
Total other long-term liabilities $ 41,513 $ 29,843