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, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Accrued lease liability $ 25,207 $ 27,760
Liabilities related to acquisitions 10,969 13,000
Other long-term liabilities 1,014 753
Total other long-term liabilities $ 37,190 $ 41,513