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Recently Issued Accounting Standards - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Prepaid expenses $ 1,660 $ 1,596
Operating lease right-of-use assets 21,891 22,304
Assets 1,120,557 1,129,755
Other long-term liabilities 1,435 1,737
Current portion of operating lease obligations 1,836 1,554
Obligations under operating leases, net of current portion 21,106 21,533
Liabilities $ 898,098 $ 903,186