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Recently Issued Accounting Standards - Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepaid and other current assets $ 1,300 $ 1,308 $ 1,456
Operating lease right-of-use assets 23,485 16,470 0
Assets 957,388   917,502
Other Liabilities   22,370 22,644
Other long-term liabilities 1,920 2,441 3,133
Current portion of operating lease obligations 1,541 2,633 0
Obligations under operating leases, net of current portion 22,673 14,655 0
Liabilities $ 732,828   $ 696,010
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepaid and other current assets   (148)  
Operating lease right-of-use assets   16,470  
Assets   16,322  
Other Liabilities   (274)  
Other long-term liabilities   (692)  
Current portion of operating lease obligations   2,633  
Obligations under operating leases, net of current portion   14,655  
Liabilities   $ 16,322